diff --git a/app/Filament/Resources/PackageAddonResource.php b/app/Filament/Resources/PackageAddonResource.php
new file mode 100644
index 0000000..55f895b
--- /dev/null
+++ b/app/Filament/Resources/PackageAddonResource.php
@@ -0,0 +1,147 @@
+<?php
+
+namespace App\Filament\Resources;
+
+use App\Filament\Resources\PackageAddonResource\Pages;
+use App\Jobs\SyncPackageAddonToPaddle;
+use App\Models\PackageAddon;
+use Filament\Actions;
+use Filament\Forms\Components\TextInput;
+use Filament\Forms\Components\Toggle;
+use Filament\Notifications\Notification;
+use Filament\Resources\Resource;
+use Filament\Schemas\Components\Section;
+use Filament\Schemas\Schema;
+use Filament\Tables;
+use Filament\Tables\Columns\BadgeColumn;
+use Filament\Tables\Columns\TextColumn;
+use Filament\Tables\Table;
+
+class PackageAddonResource extends Resource
+{
+    protected static ?string $model = PackageAddon::class;
+
+    protected static \BackedEnum|string|null $navigationIcon = 'heroicon-o-plus-circle';
+
+    protected static ?int $navigationSort = 6;
+
+    public static function getNavigationGroup(): \BackedEnum|string|null
+    {
+        return __('admin.nav.platform_management');
+    }
+
+    public static function form(Schema $schema): Schema
+    {
+        return $schema->schema([
+            Section::make('Add-on Details')
+                ->columns(2)
+                ->schema([
+                    TextInput::make('label')
+                        ->label('Label')
+                        ->required()
+                        ->maxLength(255),
+                    TextInput::make('key')
+                        ->label('Schlüssel')
+                        ->required()
+                        ->unique(ignoreRecord: true)
+                        ->maxLength(191),
+                    TextInput::make('price_id')
+                        ->label('Paddle Preis-ID')
+                        ->helperText('Paddle Billing Preis-ID für dieses Add-on')
+                        ->maxLength(191),
+                    TextInput::make('sort')
+                        ->label('Sortierung')
+                        ->numeric()
+                        ->default(0),
+                    Toggle::make('active')
+                        ->label('Aktiv')
+                        ->default(true),
+                ]),
+            Section::make('Limits-Inkremente')
+                ->columns(3)
+                ->schema([
+                    TextInput::make('extra_photos')
+                        ->label('Extra Fotos')
+                        ->numeric()
+                        ->minValue(0)
+                        ->default(0),
+                    TextInput::make('extra_guests')
+                        ->label('Extra Gäste')
+                        ->numeric()
+                        ->minValue(0)
+                        ->default(0),
+                    TextInput::make('extra_gallery_days')
+                        ->label('Galerie +Tage')
+                        ->numeric()
+                        ->minValue(0)
+                        ->default(0),
+                ]),
+        ]);
+    }
+
+    public static function table(Table $table): Table
+    {
+        return $table
+            ->columns([
+                TextColumn::make('label')
+                    ->label('Label')
+                    ->searchable()
+                    ->sortable(),
+                TextColumn::make('key')
+                    ->label('Schlüssel')
+                    ->copyable()
+                    ->sortable(),
+                TextColumn::make('price_id')
+                    ->label('Paddle Preis-ID')
+                    ->toggleable()
+                    ->copyable(),
+                TextColumn::make('extra_photos')->label('Fotos +'),
+                TextColumn::make('extra_guests')->label('Gäste +'),
+                TextColumn::make('extra_gallery_days')->label('Galerietage +'),
+                BadgeColumn::make('active')
+                    ->label('Status')
+                    ->colors([
+                        'success' => true,
+                        'danger' => false,
+                    ])
+                    ->formatStateUsing(fn (bool $state) => $state ? 'Aktiv' : 'Inaktiv'),
+                TextColumn::make('sort')
+                    ->label('Sort')
+                    ->sortable()
+                    ->toggleable(isToggledHiddenByDefault: true),
+            ])
+            ->filters([
+                Tables\Filters\TernaryFilter::make('active')
+                    ->label('Aktiv'),
+            ])
+            ->actions([
+                Actions\Action::make('syncPaddle')
+                    ->label('Mit Paddle synchronisieren')
+                    ->icon('heroicon-o-cloud-arrow-up')
+                    ->action(function (PackageAddon $record) {
+                        SyncPackageAddonToPaddle::dispatch($record->id);
+
+                        Notification::make()
+                            ->success()
+                            ->title('Paddle-Sync gestartet')
+                            ->body('Das Add-on wird im Hintergrund mit Paddle abgeglichen.')
+                            ->send();
+                    }),
+                Actions\EditAction::make(),
+            ])
+            ->bulkActions([
+                Actions\BulkActionGroup::make([
+                    Actions\DeleteBulkAction::make(),
+                ]),
+            ]);
+    }
+
+    public static function getPages(): array
+    {
+        return [
+            'index' => Pages\ListPackageAddons::route('/'),
+            'create' => Pages\CreatePackageAddon::route('/create'),
+            'edit' => Pages\EditPackageAddon::route('/{record}/edit'),
+        ];
+    }
+}
diff --git a/app/Filament/Resources/PackageAddonResource/Pages/CreatePackageAddon.php b/app/Filament/Resources/PackageAddonResource/Pages/CreatePackageAddon.php
new file mode 100644
index 0000000..58c8f79
--- /dev/null
+++ b/app/Filament/Resources/PackageAddonResource/Pages/CreatePackageAddon.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Filament\Resources\PackageAddonResource\Pages;
+
+use App\Filament\Resources\PackageAddonResource;
+use Filament\Resources\Pages\CreateRecord;
+
+class CreatePackageAddon extends CreateRecord
+{
+    protected static string $resource = PackageAddonResource::class;
+}
diff --git a/app/Filament/Resources/PackageAddonResource/Pages/EditPackageAddon.php b/app/Filament/Resources/PackageAddonResource/Pages/EditPackageAddon.php
new file mode 100644
index 0000000..706e646
--- /dev/null
+++ b/app/Filament/Resources/PackageAddonResource/Pages/EditPackageAddon.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Filament\Resources\PackageAddonResource\Pages;
+
+use App\Filament\Resources\PackageAddonResource;
+use Filament\Resources\Pages\EditRecord;
+
+class EditPackageAddon extends EditRecord
+{
+    protected static string $resource = PackageAddonResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [];
+    }
+}
diff --git a/app/Filament/Resources/PackageAddonResource/Pages/ListPackageAddons.php b/app/Filament/Resources/PackageAddonResource/Pages/ListPackageAddons.php
new file mode 100644
index 0000000..aa5973a
--- /dev/null
+++ b/app/Filament/Resources/PackageAddonResource/Pages/ListPackageAddons.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Filament\Resources\PackageAddonResource\Pages;
+
+use App\Filament\Resources\PackageAddonResource;
+use Filament\Actions;
+use Filament\Resources\Pages\ListRecords;
+
+class ListPackageAddons extends ListRecords
+{
+    protected static string $resource = PackageAddonResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\CreateAction::make(),
+        ];
+    }
+}
diff --git a/app/Http/Controllers/Api/Tenant/EventAddonCatalogController.php b/app/Http/Controllers/Api/Tenant/EventAddonCatalogController.php
new file mode 100644
index 0000000..f61b0fa
--- /dev/null
+++ b/app/Http/Controllers/Api/Tenant/EventAddonCatalogController.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Http\Controllers\Api\Tenant;
+
+use App\Http\Controllers\Controller;
+use App\Services\Addons\EventAddonCatalog;
+use Illuminate\Http\JsonResponse;
+
+class EventAddonCatalogController extends Controller
+{
+    public function __construct(private readonly EventAddonCatalog $catalog) {}
+
+    public function index(): JsonResponse
+    {
+        $addons = collect($this->catalog->all())
+            ->filter(fn (array $addon) => ! empty($addon['price_id']))
+            ->map(fn (array $addon, string $key) => array_merge($addon, ['key' => $key]))
+            ->values()
+            ->all();
+
+        return response()->json(['data' => $addons]);
+    }
+}
diff --git a/app/Http/Controllers/Api/Tenant/EventAddonController.php b/app/Http/Controllers/Api/Tenant/EventAddonController.php
new file mode 100644
index 0000000..5f76b18
--- /dev/null
+++ b/app/Http/Controllers/Api/Tenant/EventAddonController.php
@@ -0,0 +1,114 @@
+<?php
+
+namespace App\Http\Controllers\Api\Tenant;
+
+use App\Http\Controllers\Controller;
+use App\Http\Requests\Tenant\EventAddonCheckoutRequest;
+use App\Http\Requests\Tenant\EventAddonRequest;
+use App\Http\Resources\Tenant\EventResource;
+use App\Models\Event;
+use App\Services\Addons\EventAddonCheckoutService;
+use App\Support\ApiError;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Support\Carbon;
+
+class EventAddonController extends Controller
+{
+    public function __construct(private readonly EventAddonCheckoutService $checkoutService) {}
+
+    public function checkout(EventAddonCheckoutRequest $request, Event $event): JsonResponse
+    {
+        $tenantId = $request->attributes->get('tenant_id');
+
+        if ($event->tenant_id !== $tenantId) {
+            return ApiError::response(
+                'event_not_found',
+                'Event not accessible',
+                __('Das Event konnte nicht gefunden werden.'),
+                404,
+                ['event_slug' => $event->slug ?? null]
+            );
+        }
+
+        $eventPackage = $event->eventPackage ?: $event->eventPackages()
+            ->orderByDesc('purchased_at')
+            ->orderByDesc('created_at')
+            ->first();
+
+        if ($eventPackage) {
+            $event->setRelation('eventPackage', $eventPackage);
+        }
+
+        $checkout = $this->checkoutService->createCheckout(
+            $request->attributes->get('tenant'),
+            $event,
+            $request->validated(),
+        );
+
+        return response()->json([
+            'checkout_url' => $checkout['checkout_url'] ?? null,
+            'checkout_id' => $checkout['id'] ?? null,
+            'expires_at' => $checkout['expires_at'] ?? null,
+        ]);
+    }
+
+    public function apply(EventAddonRequest $request, Event $event): JsonResponse
+    {
+        $tenantId = $request->attributes->get('tenant_id');
+
+        if ($event->tenant_id !== $tenantId) {
+            return ApiError::response(
+                'event_not_found',
+                'Event not accessible',
+                __('Das Event konnte nicht gefunden werden.'),
+                404,
+                ['event_slug' => $event->slug ?? null]
+            );
+        }
+
+        $eventPackage = $event->eventPackage;
+
+        if (! $eventPackage && method_exists($event, 'eventPackages')) {
+            $eventPackage = $event->eventPackages()
+                ->with('package')
+                ->orderByDesc('purchased_at')
+                ->orderByDesc('created_at')
+                ->first();
+        }
+
+        if (! $eventPackage) {
+            return ApiError::response(
+                'event_package_missing',
+                'Event package missing',
+                __('Kein Paket ist diesem Event zugeordnet.'),
+                409,
+                ['event_slug' => $event->slug ?? null]
+            );
+        }
+
+        $data = $request->validated();
+
+        $eventPackage->fill([
+            'extra_photos' => ($eventPackage->extra_photos ?? 0) + (int) ($data['extra_photos'] ?? 0),
+            'extra_guests' => ($eventPackage->extra_guests ?? 0) + (int) ($data['extra_guests'] ?? 0),
+            'extra_gallery_days' => ($eventPackage->extra_gallery_days ?? 0) + (int) ($data['extend_gallery_days'] ?? 0),
+        ]);
+
+        if (isset($data['extend_gallery_days'])) {
+            $base = $eventPackage->gallery_expires_at ?? Carbon::now();
+            $eventPackage->gallery_expires_at = $base->copy()->addDays((int) $data['extend_gallery_days']);
+        }
+
+        $eventPackage->save();
+
+        $event->load([
+            'eventPackage.package',
+            'eventPackages.package',
+        ]);
+
+        return response()->json([
+            'message' => __('Add-ons applied successfully.'),
+            'data' => new EventResource($event),
+        ]);
+    }
+}
diff --git a/app/Http/Controllers/Api/Tenant/EventController.php b/app/Http/Controllers/Api/Tenant/EventController.php
index 3aa6273..6a87daf 100644
--- a/app/Http/Controllers/Api/Tenant/EventController.php
+++ b/app/Http/Controllers/Api/Tenant/EventController.php
@@ -192,7 +192,7 @@ class EventController extends Controller
         });
 
         $tenant->refresh();
-        $event->load(['eventType', 'tenant', 'eventPackages.package']);
+        $event->load(['eventType', 'tenant', 'eventPackages.package', 'eventPackages.addons']);
 
         return response()->json([
             'message' => 'Event created successfully',
@@ -222,7 +222,7 @@ class EventController extends Controller
             'tasks',
             'tenant' => fn ($query) => $query->select('id', 'name', 'event_credits_balance'),
             'eventPackages' => fn ($query) => $query
-                ->with('package')
+                ->with(['package', 'addons'])
                 ->orderByDesc('purchased_at')
                 ->orderByDesc('created_at'),
         ]);
diff --git a/app/Http/Controllers/Api/TenantBillingController.php b/app/Http/Controllers/Api/TenantBillingController.php
index 9d06f43..92e04ad 100644
--- a/app/Http/Controllers/Api/TenantBillingController.php
+++ b/app/Http/Controllers/Api/TenantBillingController.php
@@ -3,9 +3,11 @@
 namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller;
+use App\Models\EventPackageAddon;
 use App\Services\Paddle\PaddleTransactionService;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
+use Illuminate\Support\Arr;
 use Illuminate\Support\Facades\Log;
 
 class TenantBillingController extends Controller
@@ -60,4 +62,58 @@ class TenantBillingController extends Controller
             'meta' => $result['meta'],
         ]);
     }
+
+    public function addons(Request $request): JsonResponse
+    {
+        $tenant = $request->attributes->get('tenant');
+
+        if (! $tenant) {
+            return response()->json([
+                'data' => [],
+                'message' => 'Tenant not found.',
+            ], 404);
+        }
+
+        $perPage = max(1, min((int) $request->query('per_page', 25), 100));
+        $page = max(1, (int) $request->query('page', 1));
+
+        $paginator = EventPackageAddon::query()
+            ->where('tenant_id', $tenant->id)
+            ->with(['event:id,name,slug'])
+            ->orderByDesc('purchased_at')
+            ->orderByDesc('created_at')
+            ->paginate($perPage, ['*'], 'page', $page);
+
+        $data = $paginator->getCollection()->map(function (EventPackageAddon $addon) {
+            return [
+                'id' => $addon->id,
+                'addon_key' => $addon->addon_key,
+                'label' => $addon->metadata['label'] ?? null,
+                'quantity' => (int) ($addon->quantity ?? 1),
+                'status' => $addon->status,
+                'amount' => $addon->amount !== null ? (float) $addon->amount : null,
+                'currency' => $addon->currency,
+                'extra_photos' => (int) $addon->extra_photos,
+                'extra_guests' => (int) $addon->extra_guests,
+                'extra_gallery_days' => (int) $addon->extra_gallery_days,
+                'purchased_at' => $addon->purchased_at?->toIso8601String(),
+                'receipt_url' => Arr::get($addon->receipt_payload, 'receipt_url'),
+                'event' => $addon->event ? [
+                    'id' => $addon->event->id,
+                    'slug' => $addon->event->slug,
+                    'name' => $addon->event->name,
+                ] : null,
+            ];
+        })->values();
+
+        return response()->json([
+            'data' => $data,
+            'meta' => [
+                'current_page' => $paginator->currentPage(),
+                'last_page' => $paginator->lastPage(),
+                'per_page' => $paginator->perPage(),
+                'total' => $paginator->total(),
+            ],
+        ]);
+    }
 }
diff --git a/app/Http/Controllers/PaddleWebhookController.php b/app/Http/Controllers/PaddleWebhookController.php
index 82da983..4c6390b 100644
--- a/app/Http/Controllers/PaddleWebhookController.php
+++ b/app/Http/Controllers/PaddleWebhookController.php
@@ -2,6 +2,7 @@
 
 namespace App\Http\Controllers;
 
+use App\Services\Addons\EventAddonWebhookService;
 use App\Services\Checkout\CheckoutWebhookService;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
@@ -10,7 +11,10 @@ use Symfony\Component\HttpFoundation\Response;
 
 class PaddleWebhookController extends Controller
 {
-    public function __construct(private readonly CheckoutWebhookService $webhooks) {}
+    public function __construct(
+        private readonly CheckoutWebhookService $webhooks,
+        private readonly EventAddonWebhookService $addonWebhooks,
+    ) {}
 
     public function handle(Request $request): JsonResponse
     {
@@ -31,6 +35,7 @@ class PaddleWebhookController extends Controller
 
         if ($eventType) {
             $handled = $this->webhooks->handlePaddleEvent($payload);
+            $handled = $this->addonWebhooks->handle($payload) || $handled;
         }
 
         Log::info('Paddle webhook processed', [
diff --git a/app/Http/Requests/Tenant/EventAddonCheckoutRequest.php b/app/Http/Requests/Tenant/EventAddonCheckoutRequest.php
new file mode 100644
index 0000000..16e560f
--- /dev/null
+++ b/app/Http/Requests/Tenant/EventAddonCheckoutRequest.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Http\Requests\Tenant;
+
+use App\Services\Addons\EventAddonCatalog;
+use Illuminate\Foundation\Http\FormRequest;
+
+class EventAddonCheckoutRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function rules(): array
+    {
+        /** @var EventAddonCatalog $catalog */
+        $catalog = app(EventAddonCatalog::class);
+        $keys = array_keys($catalog->all());
+        $inRule = $keys === [] ? 'string' : 'in:'.implode(',', $keys);
+
+        return [
+            'addon_key' => ['required', 'string', $inRule],
+            'quantity' => ['nullable', 'integer', 'min:1', 'max:50'],
+            'success_url' => ['nullable', 'url'],
+            'cancel_url' => ['nullable', 'url'],
+        ];
+    }
+}
diff --git a/app/Http/Requests/Tenant/EventAddonRequest.php b/app/Http/Requests/Tenant/EventAddonRequest.php
new file mode 100644
index 0000000..442ec7c
--- /dev/null
+++ b/app/Http/Requests/Tenant/EventAddonRequest.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Http\Requests\Tenant;
+
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\ValidationException;
+
+class EventAddonRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function rules(): array
+    {
+        return [
+            'extra_photos' => ['nullable', 'integer', 'min:1'],
+            'extra_guests' => ['nullable', 'integer', 'min:1'],
+            'extend_gallery_days' => ['nullable', 'integer', 'min:1'],
+            'reason' => ['nullable', 'string', 'max:255'],
+        ];
+    }
+
+    protected function passedValidation(): void
+    {
+        if (
+            $this->input('extra_photos') === null
+            && $this->input('extra_guests') === null
+            && $this->input('extend_gallery_days') === null
+        ) {
+            throw ValidationException::withMessages([
+                'addons' => __('Please provide at least one add-on to apply.'),
+            ]);
+        }
+    }
+}
diff --git a/app/Http/Resources/Tenant/EventResource.php b/app/Http/Resources/Tenant/EventResource.php
index 5889a53..79516f9 100644
--- a/app/Http/Resources/Tenant/EventResource.php
+++ b/app/Http/Resources/Tenant/EventResource.php
@@ -6,6 +6,7 @@ use App\Services\Packages\PackageLimitEvaluator;
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\Json\JsonResource;
 use Illuminate\Http\Resources\MissingValue;
+use Illuminate\Support\Arr;
 
 class EventResource extends JsonResource
 {
@@ -76,6 +77,34 @@ class EventResource extends JsonResource
             'limits' => $eventPackage && $limitEvaluator
                 ? $limitEvaluator->summarizeEventPackage($eventPackage)
                 : null,
+            'addons' => $eventPackage ? $this->formatAddons($eventPackage) : [],
         ];
     }
+
+    protected function formatAddons(?\App\Models\EventPackage $eventPackage): array
+    {
+        if (! $eventPackage) {
+            return [];
+        }
+
+        $addons = $eventPackage->relationLoaded('addons')
+            ? $eventPackage->addons
+            : $eventPackage->addons()->latest()->take(10)->get();
+
+        return $addons->map(function ($addon) {
+            return [
+                'id' => $addon->id,
+                'key' => $addon->addon_key,
+                'label' => $addon->metadata['label'] ?? null,
+                'status' => $addon->status,
+                'price_id' => $addon->price_id,
+                'transaction_id' => $addon->transaction_id,
+                'extra_photos' => (int) $addon->extra_photos,
+                'extra_guests' => (int) $addon->extra_guests,
+                'extra_gallery_days' => (int) $addon->extra_gallery_days,
+                'purchased_at' => $addon->purchased_at?->toIso8601String(),
+                'metadata' => Arr::only($addon->metadata ?? [], ['price_eur']),
+            ];
+        })->all();
+    }
 }
diff --git a/app/Jobs/SyncPackageAddonToPaddle.php b/app/Jobs/SyncPackageAddonToPaddle.php
new file mode 100644
index 0000000..f3deeac
--- /dev/null
+++ b/app/Jobs/SyncPackageAddonToPaddle.php
@@ -0,0 +1,167 @@
+<?php
+
+namespace App\Jobs;
+
+use App\Models\PackageAddon;
+use App\Services\Paddle\Exceptions\PaddleException;
+use App\Services\Paddle\PaddleAddonCatalogService;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Support\Arr;
+use Illuminate\Support\Facades\Log;
+use Throwable;
+
+class SyncPackageAddonToPaddle implements ShouldQueue
+{
+    use Dispatchable;
+    use InteractsWithQueue;
+    use Queueable;
+    use SerializesModels;
+
+    /**
+     * @param  array{dry_run?: bool, product?: array<string, mixed>, price?: array<string, mixed>}  $options
+     */
+    public function __construct(private readonly int $addonId, private readonly array $options = []) {}
+
+    public function handle(PaddleAddonCatalogService $catalog): void
+    {
+        $addon = PackageAddon::query()->find($this->addonId);
+
+        if (! $addon) {
+            return;
+        }
+
+        $dryRun = (bool) ($this->options['dry_run'] ?? false);
+        $productOverrides = Arr::get($this->options, 'product', []);
+        $priceOverrides = Arr::get($this->options, 'price', []);
+
+        if ($dryRun) {
+            $this->storeDryRunSnapshot($catalog, $addon, $productOverrides, $priceOverrides);
+
+            return;
+        }
+
+        // Mark syncing (metadata)
+        $addon->forceFill([
+            'metadata' => array_merge($addon->metadata ?? [], [
+                'paddle_sync_status' => 'syncing',
+                'paddle_synced_at' => now()->toIso8601String(),
+            ]),
+        ])->save();
+
+        try {
+            $payloadOverrides = $this->buildPayloadOverrides($addon, $productOverrides, $priceOverrides);
+
+            $productResponse = $addon->metadata['paddle_product_id'] ?? null
+                ? $catalog->updateProduct($addon->metadata['paddle_product_id'], $addon, $payloadOverrides['product'])
+                : $catalog->createProduct($addon, $payloadOverrides['product']);
+
+            $productId = (string) ($productResponse['id'] ?? $addon->metadata['paddle_product_id'] ?? null);
+
+            if (! $productId) {
+                throw new PaddleException('Paddle product ID missing after addon sync.');
+            }
+
+            $priceResponse = $addon->price_id
+                ? $catalog->updatePrice($addon->price_id, $addon, array_merge($payloadOverrides['price'], ['product_id' => $productId]))
+                : $catalog->createPrice($addon, $productId, $payloadOverrides['price']);
+
+            $priceId = (string) ($priceResponse['id'] ?? $addon->price_id);
+
+            if (! $priceId) {
+                throw new PaddleException('Paddle price ID missing after addon sync.');
+            }
+
+            $addon->forceFill([
+                'price_id' => $priceId,
+                'metadata' => array_merge($addon->metadata ?? [], [
+                    'paddle_sync_status' => 'synced',
+                    'paddle_synced_at' => now()->toIso8601String(),
+                    'paddle_product_id' => $productId,
+                    'paddle_snapshot' => [
+                        'product' => $productResponse,
+                        'price' => $priceResponse,
+                        'payload' => $payloadOverrides,
+                    ],
+                ]),
+            ])->save();
+        } catch (Throwable $exception) {
+            Log::error('Paddle addon sync failed', [
+                'addon_id' => $addon->id,
+                'message' => $exception->getMessage(),
+                'exception' => $exception,
+            ]);
+
+            $addon->forceFill([
+                'metadata' => array_merge($addon->metadata ?? [], [
+                    'paddle_sync_status' => 'failed',
+                    'paddle_synced_at' => now()->toIso8601String(),
+                    'paddle_error' => [
+                        'message' => $exception->getMessage(),
+                        'class' => $exception::class,
+                    ],
+                ]),
+            ])->save();
+
+            throw $exception;
+        }
+    }
+
+    /**
+     * @param  array<string, mixed>  $productOverrides
+     * @param  array<string, mixed>  $priceOverrides
+     * @return array{product: array<string, mixed>, price: array<string, mixed>}
+     */
+    protected function buildPayloadOverrides(PackageAddon $addon, array $productOverrides, array $priceOverrides): array
+    {
+        // Reuse Package model payload builder shape via duck typing
+        $baseProduct = [
+            'name' => $addon->label,
+            'description' => sprintf('Addon %s', $addon->key),
+            'type' => 'standard',
+            'custom_data' => [
+                'addon_key' => $addon->key,
+                'increments' => $addon->increments,
+            ],
+        ];
+
+        $basePrice = [
+            'description' => $addon->label,
+            'custom_data' => [
+                'addon_key' => $addon->key,
+            ],
+        ];
+
+        return [
+            'product' => array_merge($baseProduct, $productOverrides),
+            'price' => array_merge($basePrice, $priceOverrides),
+        ];
+    }
+
+    /**
+     * @param  array<string, mixed>  $productOverrides
+     * @param  array<string, mixed>  $priceOverrides
+     */
+    protected function storeDryRunSnapshot(PaddleCatalogService $catalog, PackageAddon $addon, array $productOverrides, array $priceOverrides): void
+    {
+        $payloadOverrides = $this->buildPayloadOverrides($addon, $productOverrides, $priceOverrides);
+
+        $addon->forceFill([
+            'metadata' => array_merge($addon->metadata ?? [], [
+                'paddle_sync_status' => 'dry-run',
+                'paddle_synced_at' => now()->toIso8601String(),
+                'paddle_snapshot' => [
+                    'dry_run' => true,
+                    'payload' => $payloadOverrides,
+                ],
+            ]),
+        ])->save();
+
+        Log::info('Paddle addon dry-run snapshot generated', [
+            'addon_id' => $addon->id,
+        ]);
+    }
+}
diff --git a/app/Models/EventPackage.php b/app/Models/EventPackage.php
index 189e125..335adcb 100644
--- a/app/Models/EventPackage.php
+++ b/app/Models/EventPackage.php
@@ -5,6 +5,7 @@ namespace App\Models;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class EventPackage extends Model
 {
@@ -20,6 +21,10 @@ class EventPackage extends Model
         'used_photos',
         'used_guests',
         'gallery_expires_at',
+        'limits_snapshot',
+        'extra_photos',
+        'extra_guests',
+        'extra_gallery_days',
     ];
 
     protected $casts = [
@@ -30,6 +35,10 @@ class EventPackage extends Model
         'gallery_expired_notified_at' => 'datetime',
         'used_photos' => 'integer',
         'used_guests' => 'integer',
+        'extra_photos' => 'integer',
+        'extra_guests' => 'integer',
+        'extra_gallery_days' => 'integer',
+        'limits_snapshot' => 'array',
     ];
 
     public function event(): BelongsTo
@@ -42,6 +51,11 @@ class EventPackage extends Model
         return $this->belongsTo(Package::class)->withTrashed();
     }
 
+    public function addons(): HasMany
+    {
+        return $this->hasMany(EventPackageAddon::class);
+    }
+
     public function isActive(): bool
     {
         return $this->gallery_expires_at && $this->gallery_expires_at->isFuture();
@@ -53,7 +67,11 @@ class EventPackage extends Model
             return false;
         }
 
-        $maxPhotos = $this->package->max_photos ?? 0;
+        $maxPhotos = $this->effectiveLimits()['max_photos'];
+
+        if ($maxPhotos === null) {
+            return true;
+        }
 
         return $this->used_photos < $maxPhotos;
     }
@@ -64,23 +82,84 @@ class EventPackage extends Model
             return false;
         }
 
-        $maxGuests = $this->package->max_guests ?? 0;
+        $maxGuests = $this->effectiveLimits()['max_guests'];
+
+        if ($maxGuests === null) {
+            return true;
+        }
 
         return $this->used_guests < $maxGuests;
     }
 
     public function getRemainingPhotosAttribute(): int
     {
-        $max = $this->package->max_photos ?? 0;
+        $limit = $this->effectiveLimits()['max_photos'] ?? 0;
 
-        return max(0, $max - $this->used_photos);
+        return max(0, (int) $limit - $this->used_photos);
     }
 
     public function getRemainingGuestsAttribute(): int
     {
-        $max = $this->package->max_guests ?? 0;
+        $limit = $this->effectiveLimits()['max_guests'] ?? 0;
 
-        return max(0, $max - $this->used_guests);
+        return max(0, (int) $limit - $this->used_guests);
+    }
+
+    /**
+     * @return array{max_photos: ?int, max_guests: ?int, gallery_days: ?int, max_tasks: ?int, max_events_per_year: ?int}
+     */
+    public function effectiveLimits(): array
+    {
+        $snapshot = is_array($this->limits_snapshot) ? $this->limits_snapshot : [];
+
+        $base = [
+            'max_photos' => array_key_exists('max_photos', $snapshot)
+                ? $snapshot['max_photos']
+                : ($this->package->max_photos ?? null),
+            'max_guests' => array_key_exists('max_guests', $snapshot)
+                ? $snapshot['max_guests']
+                : ($this->package->max_guests ?? null),
+            'gallery_days' => array_key_exists('gallery_days', $snapshot)
+                ? $snapshot['gallery_days']
+                : ($this->package->gallery_days ?? null),
+            'max_tasks' => array_key_exists('max_tasks', $snapshot)
+                ? $snapshot['max_tasks']
+                : ($this->package->max_tasks ?? null),
+            'max_events_per_year' => array_key_exists('max_events_per_year', $snapshot)
+                ? $snapshot['max_events_per_year']
+                : ($this->package->max_events_per_year ?? null),
+        ];
+
+        $applyExtra = static function (?int $limit, int $extra): ?int {
+            if ($limit === null) {
+                return null;
+            }
+
+            $safeExtra = max(0, $extra);
+
+            return max(0, $limit + $safeExtra);
+        };
+
+        $maxPhotos = $applyExtra($this->normalizeLimit($base['max_photos']), (int) ($this->extra_photos ?? 0));
+        $maxGuests = $applyExtra($this->normalizeLimit($base['max_guests']), (int) ($this->extra_guests ?? 0));
+
+        return [
+            'max_photos' => $maxPhotos,
+            'max_guests' => $maxGuests,
+            'gallery_days' => $this->normalizeLimit($base['gallery_days']),
+            'max_tasks' => $this->normalizeLimit($base['max_tasks']),
+            'max_events_per_year' => $this->normalizeLimit($base['max_events_per_year']),
+        ];
+    }
+
+    public function effectivePhotoLimit(): ?int
+    {
+        return $this->effectiveLimits()['max_photos'];
+    }
+
+    public function effectiveGuestLimit(): ?int
+    {
+        return $this->effectiveLimits()['max_guests'];
     }
 
     protected static function boot()
@@ -95,6 +174,31 @@ class EventPackage extends Model
                 $days = $eventPackage->package->gallery_days ?? 30;
                 $eventPackage->gallery_expires_at = now()->addDays($days);
             }
+
+            if (! $eventPackage->limits_snapshot) {
+                $package = $eventPackage->relationLoaded('package')
+                    ? $eventPackage->package
+                    : Package::query()->find($eventPackage->package_id);
+
+                if ($package) {
+                    $eventPackage->limits_snapshot = array_filter([
+                        'max_photos' => $package->max_photos,
+                        'max_guests' => $package->max_guests,
+                        'gallery_days' => $package->gallery_days,
+                        'max_tasks' => $package->max_tasks,
+                        'max_events_per_year' => $package->max_events_per_year,
+                    ], static fn ($value) => $value !== null);
+                }
+            }
         });
     }
+
+    private function normalizeLimit($value): ?int
+    {
+        if ($value === null) {
+            return null;
+        }
+
+        return is_numeric($value) ? (int) $value : null;
+    }
 }
diff --git a/app/Models/EventPackageAddon.php b/app/Models/EventPackageAddon.php
new file mode 100644
index 0000000..5fa7235
--- /dev/null
+++ b/app/Models/EventPackageAddon.php
@@ -0,0 +1,66 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Casts\Attribute;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class EventPackageAddon extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'event_package_id',
+        'event_id',
+        'tenant_id',
+        'addon_key',
+        'quantity',
+        'extra_photos',
+        'extra_guests',
+        'extra_gallery_days',
+        'price_id',
+        'checkout_id',
+        'transaction_id',
+        'status',
+        'amount',
+        'currency',
+        'metadata',
+        'receipt_payload',
+        'error',
+        'purchased_at',
+    ];
+
+    protected $casts = [
+        'metadata' => 'array',
+        'receipt_payload' => 'array',
+        'purchased_at' => 'datetime',
+    ];
+
+    protected function increments(): Attribute
+    {
+        return Attribute::make(
+            get: fn () => [
+                'extra_photos' => (int) ($this->extra_photos ?? 0),
+                'extra_guests' => (int) ($this->extra_guests ?? 0),
+                'extra_gallery_days' => (int) ($this->extra_gallery_days ?? 0),
+            ],
+        );
+    }
+
+    public function eventPackage(): BelongsTo
+    {
+        return $this->belongsTo(EventPackage::class);
+    }
+
+    public function event(): BelongsTo
+    {
+        return $this->belongsTo(Event::class);
+    }
+
+    public function tenant(): BelongsTo
+    {
+        return $this->belongsTo(Tenant::class);
+    }
+}
diff --git a/app/Models/PackageAddon.php b/app/Models/PackageAddon.php
new file mode 100644
index 0000000..dda8347
--- /dev/null
+++ b/app/Models/PackageAddon.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Casts\Attribute;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class PackageAddon extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'key',
+        'label',
+        'price_id',
+        'extra_photos',
+        'extra_guests',
+        'extra_gallery_days',
+        'active',
+        'sort',
+        'metadata',
+    ];
+
+    protected $casts = [
+        'active' => 'boolean',
+        'metadata' => 'array',
+        'extra_photos' => 'integer',
+        'extra_guests' => 'integer',
+        'extra_gallery_days' => 'integer',
+        'sort' => 'integer',
+    ];
+
+    protected function increments(): Attribute
+    {
+        return Attribute::make(
+            get: fn () => [
+                'extra_photos' => (int) ($this->extra_photos ?? 0),
+                'extra_guests' => (int) ($this->extra_guests ?? 0),
+                'extra_gallery_days' => (int) ($this->extra_gallery_days ?? 0),
+            ],
+        );
+    }
+}
diff --git a/app/Notifications/Addons/AddonPurchaseReceipt.php b/app/Notifications/Addons/AddonPurchaseReceipt.php
new file mode 100644
index 0000000..4ef32fe
--- /dev/null
+++ b/app/Notifications/Addons/AddonPurchaseReceipt.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Notifications\Addons;
+
+use App\Models\EventPackageAddon;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Notification;
+
+class AddonPurchaseReceipt extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    public function __construct(private readonly EventPackageAddon $addon) {}
+
+    public function via(object $notifiable): array
+    {
+        return ['mail'];
+    }
+
+    public function toMail(object $notifiable): MailMessage
+    {
+        $event = $this->addon->event;
+        $tenant = $event?->tenant;
+        $label = $this->addon->metadata['label'] ?? $this->addon->addon_key;
+        $amount = $this->addon->amount ? number_format((float) $this->addon->amount, 2) : null;
+        $currency = $this->addon->currency ?? 'EUR';
+        $url = url('/tenant/events/'.($event?->slug ?? ''));
+
+        return (new MailMessage)
+            ->subject(__('emails.addons.receipt.subject', ['addon' => $label]))
+            ->greeting(__('emails.addons.receipt.greeting', ['name' => $tenant?->name ?? __('emails.package_limits.team_fallback')]))
+            ->line(__('emails.addons.receipt.body', [
+                'addon' => $label,
+                'event' => $event?->name['de'] ?? $event?->name['en'] ?? $event?->name ?? __('emails.package_limits.event_fallback'),
+                'amount' => $amount ? $amount.' '.$currency : __('emails.addons.receipt.unknown_amount'),
+            ]))
+            ->line(__('emails.addons.receipt.summary', [
+                'photos' => $this->addon->extra_photos,
+                'guests' => $this->addon->extra_guests,
+                'days' => $this->addon->extra_gallery_days,
+            ]))
+            ->action(__('emails.addons.receipt.action'), $url)
+            ->line(__('emails.package_limits.footer'));
+    }
+}
diff --git a/app/Notifications/Packages/EventPackageGuestLimitNotification.php b/app/Notifications/Packages/EventPackageGuestLimitNotification.php
index 294a206..0d6bafb 100644
--- a/app/Notifications/Packages/EventPackageGuestLimitNotification.php
+++ b/app/Notifications/Packages/EventPackageGuestLimitNotification.php
@@ -43,6 +43,8 @@ class EventPackageGuestLimitNotification extends Notification implements ShouldQ
                 'package' => $package?->getNameForLocale() ?? $package?->name ?? __('emails.package_limits.package_fallback'),
                 'limit' => $this->limit,
             ]))
+            ->line(__('emails.package_limits.guest_limit.cta_addon'))
+            ->action(__('emails.package_limits.guest_limit.addon_action'), $url)
             ->action(__('emails.package_limits.guest_limit.action'), $url)
             ->line(__('emails.package_limits.footer'));
     }
diff --git a/app/Notifications/Packages/EventPackagePhotoLimitNotification.php b/app/Notifications/Packages/EventPackagePhotoLimitNotification.php
index 126919f..e76a492 100644
--- a/app/Notifications/Packages/EventPackagePhotoLimitNotification.php
+++ b/app/Notifications/Packages/EventPackagePhotoLimitNotification.php
@@ -43,6 +43,8 @@ class EventPackagePhotoLimitNotification extends Notification implements ShouldQ
                 'package' => $package?->getNameForLocale() ?? $package?->name ?? __('emails.package_limits.package_fallback'),
                 'limit' => $this->limit,
             ]))
+            ->line(__('emails.package_limits.photo_limit.cta_addon'))
+            ->action(__('emails.package_limits.photo_limit.addon_action'), $url)
             ->action(__('emails.package_limits.photo_limit.action'), $url)
             ->line(__('emails.package_limits.footer'));
     }
diff --git a/app/Services/Addons/EventAddonCatalog.php b/app/Services/Addons/EventAddonCatalog.php
new file mode 100644
index 0000000..ddedf07
--- /dev/null
+++ b/app/Services/Addons/EventAddonCatalog.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace App\Services\Addons;
+
+use App\Models\PackageAddon;
+use Illuminate\Support\Arr;
+
+class EventAddonCatalog
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function all(): array
+    {
+        $dbAddons = PackageAddon::query()
+            ->where('active', true)
+            ->orderBy('sort')
+            ->get()
+            ->mapWithKeys(function (PackageAddon $addon) {
+                return [$addon->key => [
+                    'label' => $addon->label,
+                    'price_id' => $addon->price_id,
+                    'increments' => $addon->increments,
+                ]];
+            })
+            ->all();
+
+        // Fallback to config and merge (DB wins)
+        $configAddons = config('package-addons', []);
+
+        return array_merge($configAddons, $dbAddons);
+    }
+
+    /**
+     * @return array<string, mixed>|null
+     */
+    public function find(string $key): ?array
+    {
+        return $this->all()[$key] ?? null;
+    }
+
+    public function resolvePriceId(string $key): ?string
+    {
+        $addon = $this->find($key);
+
+        return $addon['price_id'] ?? null;
+    }
+
+    /**
+     * @return array<string, int>
+     */
+    public function resolveIncrements(string $key): array
+    {
+        $addon = $this->find($key) ?? [];
+
+        $increments = Arr::get($addon, 'increments', []);
+
+        return collect($increments)
+            ->map(fn ($value) => is_numeric($value) ? (int) $value : 0)
+            ->filter(fn ($value) => $value > 0)
+            ->all();
+    }
+}
diff --git a/app/Services/Addons/EventAddonCheckoutService.php b/app/Services/Addons/EventAddonCheckoutService.php
new file mode 100644
index 0000000..229ebd4
--- /dev/null
+++ b/app/Services/Addons/EventAddonCheckoutService.php
@@ -0,0 +1,112 @@
+<?php
+
+namespace App\Services\Addons;
+
+use App\Models\Event;
+use App\Models\EventPackageAddon;
+use App\Models\Tenant;
+use App\Services\Paddle\PaddleClient;
+use Illuminate\Support\Arr;
+use Illuminate\Support\Facades\Log;
+use Illuminate\Support\Str;
+use Illuminate\Validation\ValidationException;
+
+class EventAddonCheckoutService
+{
+    public function __construct(
+        private readonly EventAddonCatalog $catalog,
+        private readonly PaddleClient $paddle,
+    ) {}
+
+    /**
+     * @param  array{addon_key: string, quantity?: int, success_url?: string|null, cancel_url?: string|null}  $payload
+     * @return array{checkout_url: string|null, id: string|null, expires_at: string|null}
+     */
+    public function createCheckout(Tenant $tenant, Event $event, array $payload): array
+    {
+        $addonKey = $payload['addon_key'] ?? null;
+        $quantity = max(1, (int) ($payload['quantity'] ?? 1));
+
+        if (! $addonKey || ! $this->catalog->find($addonKey)) {
+            throw ValidationException::withMessages([
+                'addon_key' => __('Unbekanntes Add-on.'),
+            ]);
+        }
+
+        $priceId = $this->catalog->resolvePriceId($addonKey);
+
+        if (! $priceId) {
+            throw ValidationException::withMessages([
+                'addon_key' => __('Für dieses Add-on ist kein Paddle-Preis hinterlegt.'),
+            ]);
+        }
+
+        $event->loadMissing('eventPackage');
+
+        if (! $event->eventPackage) {
+            throw ValidationException::withMessages([
+                'event' => __('Kein Paket für dieses Event hinterlegt.'),
+            ]);
+        }
+
+        $addonIntent = (string) Str::uuid();
+
+        $increments = $this->catalog->resolveIncrements($addonKey);
+
+        $metadata = [
+            'tenant_id' => (string) $tenant->id,
+            'event_id' => (string) $event->id,
+            'event_package_id' => (string) $event->eventPackage->id,
+            'addon_key' => $addonKey,
+            'addon_intent' => $addonIntent,
+            'quantity' => $quantity,
+        ];
+
+        $requestPayload = array_filter([
+            'customer_id' => $tenant->paddle_customer_id,
+            'items' => [
+                [
+                    'price_id' => $priceId,
+                    'quantity' => $quantity,
+                ],
+            ],
+            'metadata' => $metadata,
+            'success_url' => $payload['success_url'] ?? null,
+            'cancel_url' => $payload['cancel_url'] ?? null,
+        ], static fn ($value) => $value !== null && $value !== '');
+
+        $response = $this->paddle->post('/checkout/links', $requestPayload);
+
+        $checkoutUrl = Arr::get($response, 'data.url') ?? Arr::get($response, 'url');
+        $checkoutId = Arr::get($response, 'data.id') ?? Arr::get($response, 'id');
+
+        if (! $checkoutUrl) {
+            Log::warning('Paddle addon checkout response missing url', ['response' => $response]);
+        }
+
+        EventPackageAddon::create([
+            'event_package_id' => $event->eventPackage->id,
+            'event_id' => $event->id,
+            'tenant_id' => $tenant->id,
+            'addon_key' => $addonKey,
+            'quantity' => $quantity,
+            'price_id' => $priceId,
+            'checkout_id' => $checkoutId,
+            'transaction_id' => null,
+            'status' => 'pending',
+            'metadata' => array_merge($metadata, [
+                'increments' => $increments,
+                'provider_payload' => $response,
+            ]),
+            'extra_photos' => ($increments['extra_photos'] ?? 0) * $quantity,
+            'extra_guests' => ($increments['extra_guests'] ?? 0) * $quantity,
+            'extra_gallery_days' => ($increments['extra_gallery_days'] ?? 0) * $quantity,
+        ]);
+
+        return [
+            'checkout_url' => $checkoutUrl,
+            'expires_at' => Arr::get($response, 'data.expires_at') ?? Arr::get($response, 'expires_at'),
+            'id' => $checkoutId,
+        ];
+    }
+}
diff --git a/app/Services/Addons/EventAddonWebhookService.php b/app/Services/Addons/EventAddonWebhookService.php
new file mode 100644
index 0000000..baf31db
--- /dev/null
+++ b/app/Services/Addons/EventAddonWebhookService.php
@@ -0,0 +1,125 @@
+<?php
+
+namespace App\Services\Addons;
+
+use App\Models\EventPackage;
+use App\Models\EventPackageAddon;
+use App\Notifications\Addons\AddonPurchaseReceipt;
+use Illuminate\Support\Arr;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Log;
+use Illuminate\Support\Facades\Notification;
+
+class EventAddonWebhookService
+{
+    public function __construct(private readonly EventAddonCatalog $catalog) {}
+
+    public function handle(array $payload): bool
+    {
+        $eventType = $payload['event_type'] ?? null;
+        $data = $payload['data'] ?? [];
+
+        if ($eventType !== 'transaction.completed') {
+            return false;
+        }
+
+        $metadata = $this->extractMetadata($data);
+        $intentId = $metadata['addon_intent'] ?? null;
+        $addonKey = $metadata['addon_key'] ?? null;
+
+        if (! $intentId || ! $addonKey) {
+            return false;
+        }
+
+        $transactionId = $data['id'] ?? $data['transaction_id'] ?? null;
+        $checkoutId = $data['checkout_id'] ?? null;
+
+        $addon = EventPackageAddon::query()
+            ->where('addon_key', $addonKey)
+            ->where(function ($query) use ($intentId, $checkoutId, $transactionId) {
+                $query->where('metadata->addon_intent', $intentId)
+                    ->orWhere('checkout_id', $checkoutId)
+                    ->orWhere('transaction_id', $transactionId);
+            })
+            ->latest('id')
+            ->first();
+
+        if (! $addon) {
+            Log::info('[AddonWebhook] Add-on intent not found', [
+                'intent' => $intentId,
+                'addon_key' => $addonKey,
+                'transaction_id' => $transactionId,
+            ]);
+
+            return false;
+        }
+
+        if ($addon->status === 'completed') {
+            return true; // idempotent
+        }
+
+        $increments = $this->catalog->resolveIncrements($addonKey);
+
+        DB::transaction(function () use ($addon, $transactionId, $checkoutId, $data, $increments) {
+            $addon->forceFill([
+                'transaction_id' => $transactionId,
+                'checkout_id' => $addon->checkout_id ?: $checkoutId,
+                'status' => 'completed',
+                'amount' => Arr::get($data, 'totals.grand_total') ?? Arr::get($data, 'amount'),
+                'currency' => Arr::get($data, 'currency_code') ?? Arr::get($data, 'currency'),
+                'metadata' => array_merge($addon->metadata ?? [], ['webhook_payload' => $data]),
+                'receipt_payload' => Arr::get($data, 'receipt_url') ? ['receipt_url' => Arr::get($data, 'receipt_url')] : null,
+                'purchased_at' => now(),
+            ])->save();
+
+            /** @var EventPackage $eventPackage */
+            $eventPackage = EventPackage::query()
+                ->lockForUpdate()
+                ->find($addon->event_package_id);
+
+            if (! $eventPackage) {
+                return;
+            }
+
+            $eventPackage->forceFill([
+                'extra_photos' => ($eventPackage->extra_photos ?? 0) + (int) ($increments['extra_photos'] ?? 0) * $addon->quantity,
+                'extra_guests' => ($eventPackage->extra_guests ?? 0) + (int) ($increments['extra_guests'] ?? 0) * $addon->quantity,
+                'extra_gallery_days' => ($eventPackage->extra_gallery_days ?? 0) + (int) ($increments['extra_gallery_days'] ?? 0) * $addon->quantity,
+            ]);
+
+            if (($increments['extra_gallery_days'] ?? 0) > 0) {
+                $base = $eventPackage->gallery_expires_at ?? now();
+                $eventPackage->gallery_expires_at = $base->copy()->addDays((int) ($increments['extra_gallery_days'] ?? 0) * $addon->quantity);
+            }
+
+            $eventPackage->save();
+
+            $tenant = $addon->tenant;
+            if ($tenant) {
+                Notification::route('mail', [$tenant->contact_email ?? $tenant->user?->email])
+                    ->notify(new AddonPurchaseReceipt($addon));
+            }
+        });
+
+        return true;
+    }
+
+    /**
+     * @param  array<string, mixed>  $data
+     * @return array<string, mixed>
+     */
+    private function extractMetadata(array $data): array
+    {
+        $metadata = [];
+
+        if (isset($data['metadata']) && is_array($data['metadata'])) {
+            $metadata = $data['metadata'];
+        }
+
+        if (isset($data['custom_data']) && is_array($data['custom_data'])) {
+            $metadata = array_merge($metadata, $data['custom_data']);
+        }
+
+        return $metadata;
+    }
+}
diff --git a/app/Services/Packages/PackageLimitEvaluator.php b/app/Services/Packages/PackageLimitEvaluator.php
index 9405eb8..1d30942 100644
--- a/app/Services/Packages/PackageLimitEvaluator.php
+++ b/app/Services/Packages/PackageLimitEvaluator.php
@@ -77,7 +77,7 @@ class PackageLimitEvaluator
             ];
         }
 
-        $maxPhotos = $eventPackage->package->max_photos;
+        $maxPhotos = $eventPackage->effectivePhotoLimit();
 
         if ($maxPhotos === null) {
             return null;
@@ -115,17 +115,17 @@ class PackageLimitEvaluator
 
     public function summarizeEventPackage(EventPackage $eventPackage): array
     {
-        $package = $eventPackage->package;
+        $limits = $eventPackage->effectiveLimits();
 
         $photoSummary = $this->buildUsageSummary(
             (int) $eventPackage->used_photos,
-            $package?->max_photos,
+            $limits['max_photos'],
             config('package-limits.photo_thresholds', [])
         );
 
         $guestSummary = $this->buildUsageSummary(
             (int) $eventPackage->used_guests,
-            $package?->max_guests,
+            $limits['max_guests'],
             config('package-limits.guest_thresholds', [])
         );
 
diff --git a/app/Services/Packages/PackageUsageTracker.php b/app/Services/Packages/PackageUsageTracker.php
index c2c73ca..7609940 100644
--- a/app/Services/Packages/PackageUsageTracker.php
+++ b/app/Services/Packages/PackageUsageTracker.php
@@ -15,7 +15,7 @@ class PackageUsageTracker
 
     public function recordPhotoUsage(EventPackage $eventPackage, int $previousUsed, int $delta = 1): void
     {
-        $limit = $eventPackage->package?->max_photos;
+        $limit = $eventPackage->effectivePhotoLimit();
 
         if ($limit === null || $limit <= 0) {
             return;
@@ -51,7 +51,7 @@ class PackageUsageTracker
 
     public function recordGuestUsage(EventPackage $eventPackage, int $previousUsed, int $delta = 1): void
     {
-        $limit = $eventPackage->package?->max_guests;
+        $limit = $eventPackage->effectiveGuestLimit();
 
         if ($limit === null || $limit <= 0) {
             return;
diff --git a/app/Services/Paddle/PaddleAddonCatalogService.php b/app/Services/Paddle/PaddleAddonCatalogService.php
new file mode 100644
index 0000000..1c66df6
--- /dev/null
+++ b/app/Services/Paddle/PaddleAddonCatalogService.php
@@ -0,0 +1,137 @@
+<?php
+
+namespace App\Services\Paddle;
+
+use App\Models\PackageAddon;
+use App\Services\Paddle\Exceptions\PaddleException;
+use Illuminate\Support\Arr;
+
+class PaddleAddonCatalogService
+{
+    public function __construct(private readonly PaddleClient $client) {}
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function createProduct(PackageAddon $addon, array $overrides = []): array
+    {
+        $payload = $this->buildProductPayload($addon, $overrides);
+
+        return $this->extractEntity($this->client->post('/products', $payload));
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function updateProduct(string $productId, PackageAddon $addon, array $overrides = []): array
+    {
+        $payload = $this->buildProductPayload($addon, $overrides);
+
+        return $this->extractEntity($this->client->patch("/products/{$productId}", $payload));
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function createPrice(PackageAddon $addon, string $productId, array $overrides = []): array
+    {
+        $payload = $this->buildPricePayload($addon, $productId, $overrides);
+
+        return $this->extractEntity($this->client->post('/prices', $payload));
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function updatePrice(string $priceId, PackageAddon $addon, array $overrides = []): array
+    {
+        $payload = $this->buildPricePayload($addon, $overrides['product_id'] ?? '', $overrides);
+
+        return $this->extractEntity($this->client->patch("/prices/{$priceId}", $payload));
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function buildProductPayload(PackageAddon $addon, array $overrides = []): array
+    {
+        $payload = array_merge([
+            'name' => $overrides['name'] ?? $addon->label,
+            'description' => $overrides['description'] ?? sprintf('Fotospiel Add-on: %s', $addon->label),
+            'tax_category' => $overrides['tax_category'] ?? 'standard',
+            'type' => $overrides['type'] ?? 'standard',
+            'custom_data' => array_merge([
+                'addon_key' => $addon->key,
+                'increments' => $addon->increments,
+            ], $overrides['custom_data'] ?? []),
+        ], Arr::except($overrides, ['tax_category', 'type', 'custom_data', 'name', 'description']));
+
+        return $this->cleanPayload($payload);
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function buildPricePayload(PackageAddon $addon, string $productId, array $overrides = []): array
+    {
+        $unitPrice = $overrides['unit_price'] ?? $this->defaultUnitPrice($addon);
+
+        $payload = array_merge([
+            'product_id' => $productId,
+            'description' => $overrides['description'] ?? $addon->label,
+            'unit_price' => $unitPrice,
+            'custom_data' => array_merge([
+                'addon_key' => $addon->key,
+            ], $overrides['custom_data'] ?? []),
+        ], Arr::except($overrides, ['unit_price', 'description', 'custom_data', 'product_id']));
+
+        return $this->cleanPayload($payload);
+    }
+
+    /**
+     * @param  array<string, mixed>  $payload
+     * @return array<string, mixed>
+     */
+    protected function extractEntity(array $payload): array
+    {
+        return Arr::get($payload, 'data', $payload);
+    }
+
+    /**
+     * @param  array<string, mixed>  $payload
+     * @return array<string, mixed>
+     */
+    protected function cleanPayload(array $payload): array
+    {
+        $filtered = collect($payload)
+            ->reject(static fn ($value) => $value === null || $value === '' || $value === [])
+            ->all();
+
+        if (array_key_exists('custom_data', $filtered)) {
+            $filtered['custom_data'] = collect($filtered['custom_data'])
+                ->reject(static fn ($value) => $value === null || $value === '' || $value === [])
+                ->all();
+        }
+
+        return $filtered;
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    protected function defaultUnitPrice(PackageAddon $addon): array
+    {
+        $metaPrice = $addon->metadata['price_eur'] ?? null;
+
+        if (! is_numeric($metaPrice)) {
+            throw new PaddleException('No unit price specified for addon. Provide metadata[price_eur] or overrides.unit_price.');
+        }
+
+        $amountCents = (int) round(((float) $metaPrice) * 100);
+
+        return [
+            'amount' => (string) $amountCents,
+            'currency_code' => 'EUR',
+        ];
+    }
+}
diff --git a/app/Services/Photobooth/PhotoboothIngestService.php b/app/Services/Photobooth/PhotoboothIngestService.php
index 897e25e..815a3ce 100644
--- a/app/Services/Photobooth/PhotoboothIngestService.php
+++ b/app/Services/Photobooth/PhotoboothIngestService.php
@@ -239,11 +239,13 @@ class PhotoboothIngestService
             return false;
         }
 
-        $limit = $eventPackage->package->max_photos;
+        $limit = $eventPackage->effectivePhotoLimit();
 
-        return $limit !== null
-            && $limit > 0
-            && $eventPackage->used_photos >= $limit;
+        if ($limit === null) {
+            return false;
+        }
+
+        return $limit > 0 && $eventPackage->used_photos >= $limit;
     }
 
     protected function resolveEmotionId(Event $event): ?int
diff --git a/app/Testing/Mailbox.php b/app/Testing/Mailbox.php
index c7db3e1..aa277f7 100644
--- a/app/Testing/Mailbox.php
+++ b/app/Testing/Mailbox.php
@@ -29,7 +29,9 @@ class Mailbox
             'html' => method_exists($event->message, 'getHtmlBody') ? $event->message->getHtmlBody() : null,
             'text' => method_exists($event->message, 'getTextBody') ? $event->message->getTextBody() : null,
             'sent_at' => now()->toIso8601String(),
-            'headers' => (string) $event->message->getHeaders(),
+            'headers' => method_exists($event->message, 'getHeaders') && method_exists($event->message->getHeaders(), 'toString')
+                ? $event->message->getHeaders()->toString()
+                : null,
         ];
 
         self::write($messages);
diff --git a/config/package-addons.php b/config/package-addons.php
new file mode 100644
index 0000000..b620b6c
--- /dev/null
+++ b/config/package-addons.php
@@ -0,0 +1,33 @@
+<?php
+
+return [
+    // Keyed add-ons with display and Paddle mapping. Amounts are base increments; multiply by quantity.
+    'extra_photos_small' => [
+        'label' => 'Extra photos (500)',
+        'price_id' => env('PADDLE_ADDON_EXTRA_PHOTOS_SMALL_PRICE_ID'),
+        'increments' => [
+            'extra_photos' => 500,
+        ],
+    ],
+    'extra_photos_large' => [
+        'label' => 'Extra photos (2,000)',
+        'price_id' => env('PADDLE_ADDON_EXTRA_PHOTOS_LARGE_PRICE_ID'),
+        'increments' => [
+            'extra_photos' => 2000,
+        ],
+    ],
+    'extra_guests' => [
+        'label' => 'Extra guests (100)',
+        'price_id' => env('PADDLE_ADDON_EXTRA_GUESTS_PRICE_ID'),
+        'increments' => [
+            'extra_guests' => 100,
+        ],
+    ],
+    'extend_gallery_30d' => [
+        'label' => 'Gallery extension (30 days)',
+        'price_id' => env('PADDLE_ADDON_EXTEND_GALLERY_30D_PRICE_ID'),
+        'increments' => [
+            'extra_gallery_days' => 30,
+        ],
+    ],
+];
diff --git a/database/migrations/2025_10_30_000000_add_limits_snapshot_and_extras_to_event_packages_table.php b/database/migrations/2025_10_30_000000_add_limits_snapshot_and_extras_to_event_packages_table.php
new file mode 100644
index 0000000..3863608
--- /dev/null
+++ b/database/migrations/2025_10_30_000000_add_limits_snapshot_and_extras_to_event_packages_table.php
@@ -0,0 +1,88 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('event_packages', function (Blueprint $table) {
+            if (! Schema::hasColumn('event_packages', 'limits_snapshot')) {
+                $table->json('limits_snapshot')->nullable()->after('package_id');
+            }
+
+            if (! Schema::hasColumn('event_packages', 'extra_photos')) {
+                $table->integer('extra_photos')->default(0)->after('used_photos');
+            }
+
+            if (! Schema::hasColumn('event_packages', 'extra_guests')) {
+                $table->integer('extra_guests')->default(0)->after('used_guests');
+            }
+
+            if (! Schema::hasColumn('event_packages', 'extra_gallery_days')) {
+                $table->integer('extra_gallery_days')->default(0)->after('gallery_expires_at');
+            }
+        });
+
+        // Backfill snapshots from current package limits where missing.
+        if (Schema::hasTable('event_packages') && Schema::hasTable('packages')) {
+            DB::table('event_packages')
+                ->whereNull('limits_snapshot')
+                ->orderBy('id')
+                ->chunkById(200, function ($rows) {
+                    foreach ($rows as $row) {
+                        $package = DB::table('packages')
+                            ->where('id', $row->package_id)
+                            ->first([
+                                'max_photos',
+                                'max_guests',
+                                'gallery_days',
+                                'max_tasks',
+                                'max_events_per_year',
+                            ]);
+
+                        if (! $package) {
+                            continue;
+                        }
+
+                        $snapshot = array_filter([
+                            'max_photos' => $package->max_photos,
+                            'max_guests' => $package->max_guests,
+                            'gallery_days' => $package->gallery_days,
+                            'max_tasks' => $package->max_tasks,
+                            'max_events_per_year' => $package->max_events_per_year,
+                        ], fn ($value) => $value !== null);
+
+                        if ($snapshot === []) {
+                            continue;
+                        }
+
+                        DB::table('event_packages')
+                            ->where('id', $row->id)
+                            ->update(['limits_snapshot' => json_encode($snapshot)]);
+                    }
+                });
+        }
+    }
+
+    public function down(): void
+    {
+        Schema::table('event_packages', function (Blueprint $table) {
+            if (Schema::hasColumn('event_packages', 'limits_snapshot')) {
+                $table->dropColumn('limits_snapshot');
+            }
+            if (Schema::hasColumn('event_packages', 'extra_photos')) {
+                $table->dropColumn('extra_photos');
+            }
+            if (Schema::hasColumn('event_packages', 'extra_guests')) {
+                $table->dropColumn('extra_guests');
+            }
+            if (Schema::hasColumn('event_packages', 'extra_gallery_days')) {
+                $table->dropColumn('extra_gallery_days');
+            }
+        });
+    }
+};
diff --git a/database/migrations/2025_10_30_110000_create_event_package_addons_table.php b/database/migrations/2025_10_30_110000_create_event_package_addons_table.php
new file mode 100644
index 0000000..9633788
--- /dev/null
+++ b/database/migrations/2025_10_30_110000_create_event_package_addons_table.php
@@ -0,0 +1,43 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('event_package_addons', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('event_package_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('event_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('tenant_id')->constrained()->cascadeOnDelete();
+            $table->string('addon_key');
+            $table->integer('quantity')->default(1);
+            $table->integer('extra_photos')->default(0);
+            $table->integer('extra_guests')->default(0);
+            $table->integer('extra_gallery_days')->default(0);
+            $table->string('price_id')->nullable();
+            $table->string('checkout_id')->nullable();
+            $table->string('transaction_id')->nullable();
+            $table->enum('status', ['pending', 'completed', 'failed'])->default('pending');
+            $table->decimal('amount', 10, 2)->nullable();
+            $table->string('currency', 3)->nullable();
+            $table->json('metadata')->nullable();
+            $table->json('receipt_payload')->nullable();
+            $table->string('error')->nullable();
+            $table->timestamp('purchased_at')->nullable();
+            $table->timestamps();
+
+            $table->index(['tenant_id', 'event_id']);
+            $table->index(['checkout_id']);
+            $table->index(['transaction_id']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('event_package_addons');
+    }
+};
diff --git a/database/migrations/2025_10_31_000000_create_package_addons_table.php b/database/migrations/2025_10_31_000000_create_package_addons_table.php
new file mode 100644
index 0000000..0daf918
--- /dev/null
+++ b/database/migrations/2025_10_31_000000_create_package_addons_table.php
@@ -0,0 +1,30 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('package_addons', function (Blueprint $table) {
+            $table->id();
+            $table->string('key')->unique();
+            $table->string('label');
+            $table->string('price_id')->nullable();
+            $table->integer('extra_photos')->default(0);
+            $table->integer('extra_guests')->default(0);
+            $table->integer('extra_gallery_days')->default(0);
+            $table->boolean('active')->default(true);
+            $table->unsignedInteger('sort')->default(0);
+            $table->json('metadata')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('package_addons');
+    }
+};
diff --git a/database/migrations/2025_11_21_104052_add_receipt_payload_to_event_package_addons_table.php b/database/migrations/2025_11_21_104052_add_receipt_payload_to_event_package_addons_table.php
new file mode 100644
index 0000000..0520562
--- /dev/null
+++ b/database/migrations/2025_11_21_104052_add_receipt_payload_to_event_package_addons_table.php
@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('event_package_addons', function (Blueprint $table) {
+            if (! Schema::hasColumn('event_package_addons', 'receipt_payload')) {
+                $table->json('receipt_payload')->nullable()->after('metadata');
+            }
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('event_package_addons', function (Blueprint $table) {
+            if (Schema::hasColumn('event_package_addons', 'receipt_payload')) {
+                $table->dropColumn('receipt_payload');
+            }
+        });
+    }
+};
diff --git a/database/seeders/DatabaseSeeder.php b/database/seeders/DatabaseSeeder.php
index a327a3c..a197c4c 100644
--- a/database/seeders/DatabaseSeeder.php
+++ b/database/seeders/DatabaseSeeder.php
@@ -16,6 +16,7 @@ class DatabaseSeeder extends Seeder
             MediaStorageTargetSeeder::class,
             LegalPagesSeeder::class,
             PackageSeeder::class,
+            PackageAddonSeeder::class,
             EventTypesSeeder::class,
             EmotionsSeeder::class,
             TaskCollectionsSeeder::class,
diff --git a/database/seeders/PackageAddonSeeder.php b/database/seeders/PackageAddonSeeder.php
new file mode 100644
index 0000000..18e5761
--- /dev/null
+++ b/database/seeders/PackageAddonSeeder.php
@@ -0,0 +1,143 @@
+<?php
+
+namespace Database\Seeders;
+
+use App\Models\PackageAddon;
+use Illuminate\Database\Seeder;
+
+class PackageAddonSeeder extends Seeder
+{
+    public function run(): void
+    {
+        $addons = [
+            [
+                'key' => 'extra_photos_500',
+                'label' => '+500 Fotos',
+                'price_id' => null,
+                'extra_photos' => 500,
+                'extra_guests' => 0,
+                'extra_gallery_days' => 0,
+                'active' => true,
+                'sort' => 10,
+                'metadata' => ['price_eur' => 5],
+            ],
+            [
+                'key' => 'extra_photos_2000',
+                'label' => '+2.000 Fotos',
+                'price_id' => null,
+                'extra_photos' => 2000,
+                'extra_guests' => 0,
+                'extra_gallery_days' => 0,
+                'active' => true,
+                'sort' => 11,
+                'metadata' => ['price_eur' => 12],
+            ],
+            [
+                'key' => 'extra_photos_5000',
+                'label' => '+5.000 Fotos',
+                'price_id' => null,
+                'extra_photos' => 5000,
+                'extra_guests' => 0,
+                'extra_gallery_days' => 0,
+                'active' => true,
+                'sort' => 12,
+                'metadata' => ['price_eur' => 25],
+            ],
+            [
+                'key' => 'extra_guests_50',
+                'label' => '+50 Gäste',
+                'price_id' => null,
+                'extra_photos' => 0,
+                'extra_guests' => 50,
+                'extra_gallery_days' => 0,
+                'active' => true,
+                'sort' => 18,
+                'metadata' => ['price_eur' => 3],
+            ],
+            [
+                'key' => 'extra_guests_100',
+                'label' => '+100 Gäste',
+                'price_id' => null,
+                'extra_photos' => 0,
+                'extra_guests' => 100,
+                'extra_gallery_days' => 0,
+                'active' => true,
+                'sort' => 19,
+                'metadata' => ['price_eur' => 5],
+            ],
+            [
+                'key' => 'extra_guests_300',
+                'label' => '+300 Gäste',
+                'price_id' => null,
+                'extra_photos' => 0,
+                'extra_guests' => 300,
+                'extra_gallery_days' => 0,
+                'active' => true,
+                'sort' => 20,
+                'metadata' => ['price_eur' => 12],
+            ],
+            [
+                'key' => 'extend_gallery_30d',
+                'label' => 'Galerie +30 Tage',
+                'price_id' => null,
+                'extra_photos' => 0,
+                'extra_guests' => 0,
+                'extra_gallery_days' => 30,
+                'active' => true,
+                'sort' => 30,
+                'metadata' => ['price_eur' => 4],
+            ],
+            [
+                'key' => 'extend_gallery_90d',
+                'label' => 'Galerie +90 Tage',
+                'price_id' => null,
+                'extra_photos' => 0,
+                'extra_guests' => 0,
+                'extra_gallery_days' => 90,
+                'active' => true,
+                'sort' => 31,
+                'metadata' => ['price_eur' => 10],
+            ],
+            [
+                'key' => 'extend_gallery_180d',
+                'label' => 'Galerie +180 Tage',
+                'price_id' => null,
+                'extra_photos' => 0,
+                'extra_guests' => 0,
+                'extra_gallery_days' => 180,
+                'active' => true,
+                'sort' => 32,
+                'metadata' => ['price_eur' => 20],
+            ],
+            [
+                'key' => 'event_boost_medium',
+                'label' => 'Event-Boost (100 Gäste, 2.000 Fotos, +30 Tage)',
+                'price_id' => null,
+                'extra_photos' => 2000,
+                'extra_guests' => 100,
+                'extra_gallery_days' => 30,
+                'active' => true,
+                'sort' => 40,
+                'metadata' => ['price_eur' => 18],
+            ],
+            [
+                'key' => 'event_boost_large',
+                'label' => 'Event-Boost (300 Gäste, 5.000 Fotos, +90 Tage)',
+                'price_id' => null,
+                'extra_photos' => 5000,
+                'extra_guests' => 300,
+                'extra_gallery_days' => 90,
+                'active' => true,
+                'sort' => 41,
+                'metadata' => ['price_eur' => 38],
+            ],
+        ];
+
+        foreach ($addons as $addon) {
+            PackageAddon::updateOrCreate(
+                ['key' => $addon['key']],
+                $addon,
+            );
+        }
+    }
+}
diff --git a/resources/js/admin/api.ts b/resources/js/admin/api.ts
index b26c1c7..a3c97f5 100644
--- a/resources/js/admin/api.ts
+++ b/resources/js/admin/api.ts
@@ -82,6 +82,7 @@ export type TenantEvent = {
     expires_at: string | null;
   } | null;
   limits?: EventLimitSummary | null;
+  addons?: EventAddonSummary[];
   [key: string]: unknown;
 };
 
@@ -156,6 +157,32 @@ export type PhotoboothStatus = {
   };
 };
 
+export type EventAddonCheckout = {
+  addon_key: string;
+  quantity?: number;
+  checkout_url: string | null;
+  checkout_id: string | null;
+  expires_at: string | null;
+};
+
+export type EventAddonCatalogItem = {
+  key: string;
+  label: string;
+  price_id: string | null;
+  increments?: Record<string, number>;
+};
+
+export type EventAddonSummary = {
+  id: number;
+  key: string;
+  label?: string | null;
+  status: 'pending' | 'completed' | 'failed';
+  extra_photos: number;
+  extra_guests: number;
+  extra_gallery_days: number;
+  purchased_at: string | null;
+};
+
 export type HelpCenterArticleSummary = {
   slug: string;
   title: string;
@@ -338,6 +365,28 @@ export type PaddleTransactionSummary = {
   tax?: number | null;
 };
 
+export type TenantAddonEventSummary = {
+  id: number;
+  slug: string;
+  name: string | Record<string, string> | null;
+};
+
+export type TenantAddonHistoryEntry = {
+  id: number;
+  addon_key: string;
+  label?: string | null;
+  event: TenantAddonEventSummary | null;
+  amount: number | null;
+  currency: string | null;
+  status: 'pending' | 'completed' | 'failed';
+  purchased_at: string | null;
+  extra_photos: number;
+  extra_guests: number;
+  extra_gallery_days: number;
+  quantity: number;
+  receipt_url?: string | null;
+};
+
 export type CreditLedgerEntry = {
   id: number;
   delta: number;
@@ -829,6 +878,48 @@ function normalizePaddleTransaction(entry: JsonValue): PaddleTransactionSummary
   };
 }
 
+function normalizeTenantAddonHistoryEntry(entry: JsonValue): TenantAddonHistoryEntry {
+  let event: TenantAddonEventSummary | null = null;
+
+  if (entry.event && typeof entry.event === 'object') {
+    const rawEvent = entry.event as JsonValue;
+    const id = Number((rawEvent as { id?: unknown }).id ?? 0);
+    const slugValue = (rawEvent as { slug?: unknown }).slug;
+    const rawName = (rawEvent as { name?: unknown }).name ?? null;
+    let name: TenantAddonEventSummary['name'] = null;
+
+    if (typeof rawName === 'string') {
+      name = rawName;
+    } else if (rawName && typeof rawName === 'object') {
+      name = normalizeTranslationMap(rawName, undefined, true);
+    }
+
+    event = {
+      id,
+      slug: typeof slugValue === 'string' ? slugValue : '',
+      name,
+    };
+  }
+
+  const amountValue = entry.amount;
+
+  return {
+    id: Number(entry.id ?? 0),
+    addon_key: String(entry.addon_key ?? ''),
+    label: typeof entry.label === 'string' ? entry.label : null,
+    event,
+    amount: amountValue !== undefined && amountValue !== null ? Number(amountValue) : null,
+    currency: typeof entry.currency === 'string' ? entry.currency : null,
+    status: (entry.status as TenantAddonHistoryEntry['status']) ?? 'pending',
+    purchased_at: typeof entry.purchased_at === 'string' ? entry.purchased_at : null,
+    extra_photos: Number(entry.extra_photos ?? 0),
+    extra_guests: Number(entry.extra_guests ?? 0),
+    extra_gallery_days: Number(entry.extra_gallery_days ?? 0),
+    quantity: Number(entry.quantity ?? 1),
+    receipt_url: typeof entry.receipt_url === 'string' ? entry.receipt_url : null,
+  };
+}
+
 function normalizeTask(task: JsonValue): TenantTask {
   const titleTranslations = normalizeTranslationMap(task.title_translations ?? task.title ?? {});
   const descriptionTranslations = normalizeTranslationMap(task.description_translations ?? task.description ?? {});
@@ -1122,6 +1213,28 @@ export async function getEvent(slug: string): Promise<TenantEvent> {
   return normalizeEvent(data.data);
 }
 
+export async function createEventAddonCheckout(
+  eventSlug: string,
+  params: { addon_key: string; quantity?: number; success_url?: string; cancel_url?: string }
+): Promise<{ checkout_url: string | null; checkout_id: string | null; expires_at: string | null }> {
+  const response = await authorizedFetch(`${eventEndpoint(eventSlug)}/addons/checkout`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(params),
+  });
+
+  return await jsonOrThrow<{ checkout_url: string | null; checkout_id: string | null; expires_at: string | null }>(
+    response,
+    'Failed to create addon checkout'
+  );
+}
+
+export async function getAddonCatalog(): Promise<EventAddonCatalogItem[]> {
+  const response = await authorizedFetch('/api/v1/tenant/addons/catalog');
+  const data = await jsonOrThrow<{ data?: EventAddonCatalogItem[] }>(response, 'Failed to load add-ons');
+  return data.data ?? [];
+}
+
 export async function getEventTypes(): Promise<TenantEventType[]> {
   const response = await authorizedFetch('/api/v1/tenant/event-types');
   const data = await jsonOrThrow<{ data?: JsonValue[] }>(response, 'Failed to load event types');
@@ -1675,6 +1788,42 @@ export async function getTenantPaddleTransactions(cursor?: string): Promise<{
   };
 }
 
+export async function getTenantAddonHistory(page = 1, perPage = 25): Promise<{
+  data: TenantAddonHistoryEntry[];
+  meta: PaginationMeta;
+}> {
+  const params = new URLSearchParams({
+    page: String(Math.max(1, page)),
+    per_page: String(Math.max(1, Math.min(perPage, 100))),
+  });
+
+  const response = await authorizedFetch(`/api/v1/tenant/billing/addons?${params.toString()}`);
+
+  if (response.status === 404) {
+    return {
+      data: [],
+      meta: { current_page: 1, last_page: 1, per_page: perPage, total: 0 },
+    };
+  }
+
+  const payload = await jsonOrThrow<{ data?: JsonValue[]; meta?: Partial<PaginationMeta>; current_page?: number; last_page?: number; per_page?: number; total?: number }>(
+    response,
+    'Failed to load add-on history'
+  );
+
+  const rows = Array.isArray(payload.data) ? payload.data.map((row) => normalizeTenantAddonHistoryEntry(row)) : [];
+  const metaSource = payload.meta ?? payload;
+
+  const meta: PaginationMeta = {
+    current_page: Number(metaSource.current_page ?? 1),
+    last_page: Number(metaSource.last_page ?? 1),
+    per_page: Number(metaSource.per_page ?? perPage),
+    total: Number(metaSource.total ?? rows.length),
+  };
+
+  return { data: rows, meta };
+}
+
 export async function getCreditBalance(): Promise<CreditBalance> {
   const response = await authorizedFetch('/api/v1/tenant/credits/balance');
   if (response.status === 404) {
diff --git a/resources/js/admin/components/Addons/AddonSummaryList.tsx b/resources/js/admin/components/Addons/AddonSummaryList.tsx
new file mode 100644
index 0000000..cc2e844
--- /dev/null
+++ b/resources/js/admin/components/Addons/AddonSummaryList.tsx
@@ -0,0 +1,66 @@
+import React from 'react';
+import { Badge } from '@/components/ui/badge';
+import type { EventAddonSummary } from '../../api';
+
+type Props = {
+  addons: EventAddonSummary[];
+  t: (key: string, fallback: string) => string;
+};
+
+export function AddonSummaryList({ addons, t }: Props) {
+  if (!addons.length) {
+    return null;
+  }
+
+  return (
+    <div className="space-y-3">
+      {addons.map((addon) => (
+        <div key={addon.id} className="flex flex-col gap-1 rounded-2xl border border-slate-200/70 bg-white/70 p-4 text-sm dark:border-white/10 dark:bg-white/5 sm:flex-row sm:items-center sm:justify-between">
+          <div>
+            <p className="font-semibold text-slate-900 dark:text-white">{addon.label ?? addon.key}</p>
+            <p className="text-xs text-slate-500">
+              {buildSummary(addon, t)}
+            </p>
+            {addon.purchased_at ? (
+              <p className="text-xs text-slate-400">
+                {t('events.sections.addons.purchasedAt', `Purchased ${new Date(addon.purchased_at).toLocaleString()}`, {
+                  date: new Date(addon.purchased_at).toLocaleString(),
+                })}
+              </p>
+            ) : null}
+          </div>
+          <Badge variant={addon.status === 'completed' ? 'outline' : addon.status === 'pending' ? 'secondary' : 'destructive'}>
+            {t(`events.sections.addons.status.${addon.status}`, addon.status)}
+          </Badge>
+        </div>
+      ))}
+    </div>
+  );
+}
+
+function buildSummary(addon: EventAddonSummary, t: (key: string, fallback: string, options?: Record<string, unknown>) => string): string {
+  const parts: string[] = [];
+  if (addon.extra_photos > 0) {
+    parts.push(
+      t('events.sections.addons.summary.photos', `+${addon.extra_photos} photos`, {
+        count: addon.extra_photos.toLocaleString(),
+      }),
+    );
+  }
+  if (addon.extra_guests > 0) {
+    parts.push(
+      t('events.sections.addons.summary.guests', `+${addon.extra_guests} guests`, {
+        count: addon.extra_guests.toLocaleString(),
+      }),
+    );
+  }
+  if (addon.extra_gallery_days > 0) {
+    parts.push(
+      t('events.sections.addons.summary.gallery', `+${addon.extra_gallery_days} days gallery`, {
+        count: addon.extra_gallery_days,
+      }),
+    );
+  }
+
+  return parts.join(' · ');
+}
diff --git a/resources/js/admin/components/Addons/AddonsPicker.tsx b/resources/js/admin/components/Addons/AddonsPicker.tsx
new file mode 100644
index 0000000..1fd270f
--- /dev/null
+++ b/resources/js/admin/components/Addons/AddonsPicker.tsx
@@ -0,0 +1,64 @@
+import React from 'react';
+import { ShoppingCart } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
+import { EventAddonCatalogItem } from '../../api';
+
+type Props = {
+  addons: EventAddonCatalogItem[];
+  scope: 'photos' | 'guests' | 'gallery';
+  onCheckout: (addonKey: string) => void;
+  busy?: boolean;
+  t: (key: string, fallback: string) => string;
+};
+
+const scopeDefaults: Record<Props['scope'], string[]> = {
+  photos: ['extra_photos_500', 'extra_photos_2000'],
+  guests: ['extra_guests_50', 'extra_guests_100'],
+  gallery: ['extend_gallery_30d', 'extend_gallery_90d'],
+};
+
+export function AddonsPicker({ addons, scope, onCheckout, busy, t }: Props) {
+  const options = React.useMemo(() => {
+    const whitelist = scopeDefaults[scope];
+    const filtered = addons.filter((addon) => whitelist.includes(addon.key));
+    return filtered.length ? filtered : addons;
+  }, [addons, scope]);
+
+  const [selected, setSelected] = React.useState<string | undefined>(() => options[0]?.key);
+
+  React.useEffect(() => {
+    setSelected(options[0]?.key);
+  }, [options]);
+
+  if (!options.length) {
+    return null;
+  }
+
+  return (
+    <div className="flex flex-col gap-2 sm:flex-row sm:items-center sm:gap-3">
+      <Select value={selected} onValueChange={(value) => setSelected(value)}>
+        <SelectTrigger className="w-full sm:w-64">
+          <SelectValue placeholder={t('addons.selectPlaceholder', 'Add-on auswählen')} />
+        </SelectTrigger>
+        <SelectContent>
+          {options.map((addon) => (
+            <SelectItem key={addon.key} value={addon.key} disabled={!addon.price_id}>
+              {addon.label}
+              {!addon.price_id ? ' (kein Preis verknüpft)' : ''}
+            </SelectItem>
+          ))}
+        </SelectContent>
+      </Select>
+      <Button
+        variant="outline"
+        size="sm"
+        disabled={!selected || busy || !options.find((a) => a.key === selected)?.price_id}
+        onClick={() => selected && onCheckout(selected)}
+      >
+        <ShoppingCart className="mr-2 h-4 w-4" />
+        {t('addons.buyNow', 'Jetzt freischalten')}
+      </Button>
+    </div>
+  );
+}
diff --git a/resources/js/admin/i18n/locales/de/common.json b/resources/js/admin/i18n/locales/de/common.json
index 71becab..d11bc03 100644
--- a/resources/js/admin/i18n/locales/de/common.json
+++ b/resources/js/admin/i18n/locales/de/common.json
@@ -72,6 +72,9 @@
     "galleryWarningDay": "Galerie läuft in {days} Tag ab.",
     "galleryWarningDays": "Galerie läuft in {days} Tagen ab.",
     "galleryExpired": "Galerie ist abgelaufen. Gäste sehen keine Inhalte mehr.",
-    "unlimited": "Unbegrenzt"
+    "unlimited": "Unbegrenzt",
+    "buyMorePhotos": "Mehr Fotos freischalten",
+    "buyMoreGuests": "Mehr Gäste freischalten",
+    "extendGallery": "Galerie verlängern"
   }
 }
diff --git a/resources/js/admin/i18n/locales/de/management.json b/resources/js/admin/i18n/locales/de/management.json
index 78f01bc..ab90d06 100644
--- a/resources/js/admin/i18n/locales/de/management.json
+++ b/resources/js/admin/i18n/locales/de/management.json
@@ -80,6 +80,32 @@
         "loadingMore": "Laden…"
       }
     },
+    "addOns": {
+      "title": "Add-on-Verlauf",
+      "description": "Einmalige Add-ons, die für diesen Tenant gebucht wurden.",
+      "empty": "Noch keine Add-ons gebucht.",
+      "badge": "Add-ons",
+      "table": {
+        "addon": "Add-on",
+        "event": "Event",
+        "amount": "Betrag",
+        "status": "Status",
+        "purchased": "Gekauft",
+        "eventFallback": "Event archiviert"
+      },
+      "status": {
+        "pending": "In Bearbeitung",
+        "completed": "Abgeschlossen",
+        "failed": "Fehlgeschlagen"
+      },
+      "extras": {
+        "photos": "+{{count}} Fotos",
+        "guests": "+{{count}} Gäste",
+        "gallery": "+{{count}} Galerietage"
+      },
+      "loadMore": "Weitere Add-ons laden",
+      "loadingMore": "Add-ons werden geladen…"
+    },
     "packages": {
       "title": "Paket-Historie",
       "description": "Übersicht über aktive und vergangene Pakete.",
@@ -382,7 +408,8 @@
       "backToEvent": "Event öffnen",
       "copy": "Link kopieren",
       "copied": "Kopiert!",
-      "deactivate": "Deaktivieren"
+      "deactivate": "Deaktivieren",
+      "buyMoreGuests": "Mehr Gäste freischalten"
     },
     "labels": {
       "usage": "Nutzung",
@@ -511,11 +538,16 @@
       "loadFailed": "Event konnte nicht geladen werden.",
       "notFoundTitle": "Event nicht gefunden",
       "notFoundBody": "Ohne gültige Kennung können wir keine Daten laden. Kehre zur Eventliste zurück und wähle dort ein Event aus.",
-      "toggleFailed": "Status konnte nicht angepasst werden."
+      "toggleFailed": "Status konnte nicht angepasst werden.",
+      "checkoutMissing": "Checkout konnte nicht gestartet werden.",
+      "checkoutFailed": "Add-on Checkout fehlgeschlagen."
     },
     "alerts": {
       "failedTitle": "Aktion fehlgeschlagen"
     },
+    "success": {
+      "addonApplied": "Add-on angewendet. Limits aktualisieren sich in Kürze."
+    },
     "placeholders": {
       "untitled": "Unbenanntes Event"
     },
@@ -526,7 +558,10 @@
       "tasks": "Aufgaben verwalten",
       "invites": "Einladungen & Layouts",
       "photos": "Fotos moderieren",
-      "refresh": "Aktualisieren"
+      "refresh": "Aktualisieren",
+      "buyMorePhotos": "Mehr Fotos freischalten",
+      "buyMoreGuests": "Mehr Gäste freischalten",
+      "extendGallery": "Galerie verlängern"
     },
     "workspace": {
       "detailSubtitle": "Behalte Status, Aufgaben und Einladungen deines Events im Blick.",
@@ -552,6 +587,23 @@
       "activeYes": "Ja",
       "activeNo": "Nein"
     },
+    "sections": {
+      "addons": {
+        "title": "Add-ons & Upgrades",
+        "description": "Zuletzt gebuchte Add-ons für dieses Event.",
+        "status": {
+          "completed": "Aktiv",
+          "pending": "In Bearbeitung",
+          "failed": "Fehlgeschlagen"
+        },
+        "purchasedAt": "Gekauft {{date}}",
+        "summary": {
+          "photos": "+{{count}} Fotos",
+          "guests": "+{{count}} Gäste",
+          "gallery": "+{{count}} Tage Galerie"
+        }
+      }
+    },
     "status": {
       "published": "Veröffentlicht",
       "draft": "Entwurf",
diff --git a/resources/js/admin/i18n/locales/en/common.json b/resources/js/admin/i18n/locales/en/common.json
index 8bc277c..49db6af 100644
--- a/resources/js/admin/i18n/locales/en/common.json
+++ b/resources/js/admin/i18n/locales/en/common.json
@@ -72,6 +72,9 @@
     "galleryWarningDay": "Gallery expires in {days} day.",
     "galleryWarningDays": "Gallery expires in {days} days.",
     "galleryExpired": "Gallery has expired. Guests can no longer access the photos.",
-    "unlimited": "Unlimited"
+    "unlimited": "Unlimited",
+    "buyMorePhotos": "Unlock more photos",
+    "buyMoreGuests": "Unlock more guests",
+    "extendGallery": "Extend gallery"
   }
 }
diff --git a/resources/js/admin/i18n/locales/en/management.json b/resources/js/admin/i18n/locales/en/management.json
index 32f2f02..249d115 100644
--- a/resources/js/admin/i18n/locales/en/management.json
+++ b/resources/js/admin/i18n/locales/en/management.json
@@ -80,6 +80,32 @@
         "loadingMore": "Loading…"
       }
     },
+    "addOns": {
+      "title": "Add-on history",
+      "description": "One-time add-ons purchased for this tenant.",
+      "empty": "No add-ons purchased yet.",
+      "badge": "Add-ons",
+      "table": {
+        "addon": "Add-on",
+        "event": "Event",
+        "amount": "Amount",
+        "status": "Status",
+        "purchased": "Purchased",
+        "eventFallback": "Event archived"
+      },
+      "status": {
+        "pending": "Processing",
+        "completed": "Completed",
+        "failed": "Failed"
+      },
+      "extras": {
+        "photos": "+{{count}} photos",
+        "guests": "+{{count}} guests",
+        "gallery": "+{{count}} gallery days"
+      },
+      "loadMore": "Load more add-ons",
+      "loadingMore": "Loading add-ons…"
+    },
     "packages": {
       "title": "Package history",
       "description": "Overview of current and past packages.",
@@ -382,7 +408,8 @@
       "backToEvent": "Open event",
       "copy": "Copy link",
       "copied": "Copied!",
-      "deactivate": "Deactivate"
+      "deactivate": "Deactivate",
+      "buyMoreGuests": "Unlock more guests"
     },
     "labels": {
       "usage": "Usage",
@@ -511,11 +538,16 @@
       "loadFailed": "Event could not be loaded.",
       "notFoundTitle": "Event not found",
       "notFoundBody": "Without a valid identifier we can’t load the data. Return to the list and choose an event.",
-      "toggleFailed": "Status could not be updated."
+      "toggleFailed": "Status could not be updated.",
+      "checkoutMissing": "Checkout could not be started.",
+      "checkoutFailed": "Add-on checkout failed."
     },
     "alerts": {
       "failedTitle": "Action failed"
     },
+    "success": {
+      "addonApplied": "Add-on applied. Limits will refresh shortly."
+    },
     "placeholders": {
       "untitled": "Untitled event"
     },
@@ -526,7 +558,10 @@
       "tasks": "Manage tasks",
       "invites": "Invites & layouts",
       "photos": "Moderate photos",
-      "refresh": "Refresh"
+      "refresh": "Refresh",
+      "buyMorePhotos": "Unlock more photos",
+      "buyMoreGuests": "Unlock more guests",
+      "extendGallery": "Extend gallery"
     },
     "workspace": {
       "detailSubtitle": "Keep status, tasks, and invites of your event in one view.",
@@ -552,6 +587,23 @@
       "activeYes": "Yes",
       "activeNo": "No"
     },
+    "sections": {
+      "addons": {
+        "title": "Add-ons & Boosts",
+        "description": "Recently purchased add-ons for this event.",
+        "status": {
+          "completed": "Active",
+          "pending": "Processing",
+          "failed": "Failed"
+        },
+        "purchasedAt": "Purchased {{date}}",
+        "summary": {
+          "photos": "+{{count}} photos",
+          "guests": "+{{count}} guests",
+          "gallery": "+{{count}} days gallery"
+        }
+      }
+    },
     "status": {
       "published": "Published",
       "draft": "Draft",
diff --git a/resources/js/admin/pages/BillingPage.tsx b/resources/js/admin/pages/BillingPage.tsx
index 72df793..853e176 100644
--- a/resources/js/admin/pages/BillingPage.tsx
+++ b/resources/js/admin/pages/BillingPage.tsx
@@ -8,7 +8,15 @@ import { Button } from '@/components/ui/button';
 import { Separator } from '@/components/ui/separator';
 
 import { AdminLayout } from '../components/AdminLayout';
-import { getTenantPackagesOverview, getTenantPaddleTransactions, PaddleTransactionSummary, TenantPackageSummary } from '../api';
+import {
+  getTenantPackagesOverview,
+  getTenantPaddleTransactions,
+  getTenantAddonHistory,
+  PaddleTransactionSummary,
+  TenantAddonHistoryEntry,
+  TenantPackageSummary,
+  PaginationMeta,
+} from '../api';
 import { isAuthError } from '../auth/tokens';
 import {
   TenantHeroCard,
@@ -34,6 +42,9 @@ export default function BillingPage() {
   const [transactionCursor, setTransactionCursor] = React.useState<string | null>(null);
   const [transactionsHasMore, setTransactionsHasMore] = React.useState(false);
   const [transactionsLoading, setTransactionsLoading] = React.useState(false);
+  const [addonHistory, setAddonHistory] = React.useState<TenantAddonHistoryEntry[]>([]);
+  const [addonMeta, setAddonMeta] = React.useState<PaginationMeta | null>(null);
+  const [addonsLoading, setAddonsLoading] = React.useState(false);
   const [loading, setLoading] = React.useState(true);
   const [error, setError] = React.useState<string | null>(null);
 
@@ -55,6 +66,33 @@ export default function BillingPage() {
     [locale]
   );
 
+  const resolveEventName = React.useCallback(
+    (event: TenantAddonHistoryEntry['event']) => {
+      const fallback = t('billing.sections.addOns.table.eventFallback', 'Event removed');
+      if (!event) {
+        return fallback;
+      }
+
+      if (typeof event.name === 'string' && event.name.trim().length > 0) {
+        return event.name;
+      }
+
+      if (event.name && typeof event.name === 'object') {
+        const lang = i18n.language?.split('-')[0] ?? 'de';
+        return (
+          event.name[lang] ??
+          event.name.de ??
+          event.name.en ??
+          Object.values(event.name)[0] ??
+          fallback
+        );
+      }
+
+      return fallback;
+    },
+    [i18n.language, t]
+  );
+
   const packageLabels = React.useMemo(
     () => ({
       statusActive: t('billing.sections.packages.card.statusActive'),
@@ -70,18 +108,24 @@ export default function BillingPage() {
     setLoading(true);
     setError(null);
     try {
-      const [packagesResult, paddleTransactions] = await Promise.all([
+      const [packagesResult, paddleTransactions, addonHistoryResult] = await Promise.all([
         getTenantPackagesOverview(force ? { force: true } : undefined),
         getTenantPaddleTransactions().catch((err) => {
           console.warn('Failed to load Paddle transactions', err);
           return { data: [] as PaddleTransactionSummary[], nextCursor: null, hasMore: false };
         }),
+        getTenantAddonHistory().catch((err) => {
+          console.warn('Failed to load add-on history', err);
+          return { data: [] as TenantAddonHistoryEntry[], meta: { current_page: 1, last_page: 1, per_page: 25, total: 0 } };
+        }),
       ]);
       setPackages(packagesResult.packages);
       setActivePackage(packagesResult.activePackage);
       setTransactions(paddleTransactions.data);
       setTransactionCursor(paddleTransactions.nextCursor);
       setTransactionsHasMore(paddleTransactions.hasMore);
+      setAddonHistory(addonHistoryResult.data);
+      setAddonMeta(addonHistoryResult.meta);
     } catch (err) {
       if (!isAuthError(err)) {
         setError(t('billing.errors.load'));
@@ -110,6 +154,24 @@ export default function BillingPage() {
     }
   }, [transactionCursor, transactionsHasMore, transactionsLoading]);
 
+  const loadMoreAddons = React.useCallback(async () => {
+    if (addonsLoading || !addonMeta || addonMeta.current_page >= addonMeta.last_page) {
+      return;
+    }
+
+    setAddonsLoading(true);
+    try {
+      const nextPage = addonMeta.current_page + 1;
+      const result = await getTenantAddonHistory(nextPage);
+      setAddonHistory((current) => [...current, ...result.data]);
+      setAddonMeta(result.meta);
+    } catch (error) {
+      console.warn('Failed to load additional add-on history', error);
+    } finally {
+      setAddonsLoading(false);
+    }
+  }, [addonMeta, addonsLoading]);
+
   React.useEffect(() => {
     void loadAll();
   }, [loadAll]);
@@ -118,6 +180,12 @@ export default function BillingPage() {
     () => buildPackageWarnings(activePackage, t, formatDate, 'billing.sections.overview.warnings'),
     [activePackage, t, formatDate],
   );
+  const hasMoreAddons = React.useMemo(() => {
+    if (!addonMeta) {
+      return false;
+    }
+    return addonMeta.current_page < addonMeta.last_page;
+  }, [addonMeta]);
 
   const heroBadge = t('billing.hero.badge', 'Abrechnung');
   const heroDescription = t('billing.hero.description', 'Behalte Laufzeiten, Rechnungen und Limits deiner Pakete im Blick.');
@@ -288,6 +356,38 @@ export default function BillingPage() {
             </div>
           </SectionCard>
 
+          <SectionCard className="space-y-4">
+            <SectionHeader
+              eyebrow={t('billing.sections.addOns.badge', 'Add-ons')}
+              title={t('billing.sections.addOns.title')}
+              description={t('billing.sections.addOns.description')}
+            />
+            {addonHistory.length === 0 ? (
+              <EmptyState message={t('billing.sections.addOns.empty')} />
+            ) : (
+              <AddonHistoryTable
+                items={addonHistory}
+                formatCurrency={formatCurrency}
+                formatDate={formatDate}
+                resolveEventName={resolveEventName}
+                locale={locale}
+                t={t}
+              />
+            )}
+            {hasMoreAddons && (
+              <Button variant="outline" onClick={() => void loadMoreAddons()} disabled={addonsLoading}>
+                {addonsLoading ? (
+                  <>
+                    <Loader2 className="mr-2 h-4 w-4 animate-spin" />
+                    {t('billing.sections.addOns.loadingMore', 'Loading add-ons...')}
+                  </>
+                ) : (
+                  t('billing.sections.addOns.loadMore', 'Load more add-ons')
+                )}
+              </Button>
+            )}
+          </SectionCard>
+
           <SectionCard className="space-y-4">
             <SectionHeader
               eyebrow={t('billing.sections.transactions.badge', 'Transaktionen')}
@@ -336,6 +436,118 @@ export default function BillingPage() {
   );
 }
 
+function AddonHistoryTable({
+  items,
+  formatCurrency,
+  formatDate,
+  resolveEventName,
+  locale,
+  t,
+}: {
+  items: TenantAddonHistoryEntry[];
+  formatCurrency: (value: number | null | undefined, currency?: string) => string;
+  formatDate: (value: string | null | undefined) => string;
+  resolveEventName: (event: TenantAddonHistoryEntry['event']) => string;
+  locale: string;
+  t: (key: string, options?: Record<string, unknown>) => string;
+}) {
+  const extrasLabel = (key: 'photos' | 'guests' | 'gallery', count: number) =>
+    t(`billing.sections.addOns.extras.${key}`, { count });
+
+  return (
+    <FrostedSurface className="overflow-x-auto border border-slate-200/60 p-0 dark:border-slate-800/70">
+      <table className="min-w-full divide-y divide-slate-200 text-sm dark:divide-slate-800">
+        <thead className="bg-slate-50/60 text-left text-xs font-semibold uppercase tracking-wide text-slate-500 dark:bg-slate-900/20 dark:text-slate-400">
+          <tr>
+            <th className="px-4 py-3">{t('billing.sections.addOns.table.addon')}</th>
+            <th className="px-4 py-3">{t('billing.sections.addOns.table.event')}</th>
+            <th className="px-4 py-3">{t('billing.sections.addOns.table.amount')}</th>
+            <th className="px-4 py-3">{t('billing.sections.addOns.table.status')}</th>
+            <th className="px-4 py-3">{t('billing.sections.addOns.table.purchased')}</th>
+          </tr>
+        </thead>
+        <tbody className="divide-y divide-slate-100 dark:divide-slate-800/70">
+          {items.map((item) => {
+            const extras: string[] = [];
+            if (item.extra_photos > 0) {
+              extras.push(extrasLabel('photos', item.extra_photos));
+            }
+            if (item.extra_guests > 0) {
+              extras.push(extrasLabel('guests', item.extra_guests));
+            }
+            if (item.extra_gallery_days > 0) {
+              extras.push(extrasLabel('gallery', item.extra_gallery_days));
+            }
+
+            const purchasedLabel = item.purchased_at
+              ? new Date(item.purchased_at).toLocaleString(locale, {
+                  year: 'numeric',
+                  month: 'short',
+                  day: '2-digit',
+                  hour: '2-digit',
+                  minute: '2-digit',
+                })
+              : formatDate(item.purchased_at);
+
+            const statusKey = `billing.sections.addOns.status.${item.status}`;
+            const statusLabel = t(statusKey, { defaultValue: item.status });
+            const statusTone: Record<string, string> = {
+              completed: 'bg-emerald-500/15 text-emerald-700 dark:bg-emerald-500/20 dark:text-emerald-200',
+              pending: 'bg-amber-500/15 text-amber-700 dark:bg-amber-500/20 dark:text-amber-200',
+              failed: 'bg-rose-500/15 text-rose-700 dark:bg-rose-500/20 dark:text-rose-200',
+            };
+
+            return (
+              <tr key={item.id} className="bg-white even:bg-slate-50/40 dark:bg-slate-950/50 dark:even:bg-slate-900/40">
+                <td className="px-4 py-3 align-top">
+                  <div className="flex items-center gap-2 text-slate-900 dark:text-slate-100">
+                    <span className="font-semibold">{item.label ?? item.addon_key}</span>
+                    {item.quantity > 1 ? (
+                      <Badge variant="outline" className="border-slate-200/70 text-[11px] font-medium dark:border-slate-700">
+                        ×{item.quantity}
+                      </Badge>
+                    ) : null}
+                  </div>
+                  {extras.length > 0 ? (
+                    <p className="mt-1 text-xs text-slate-500 dark:text-slate-400">{extras.join(' · ')}</p>
+                  ) : null}
+                </td>
+                <td className="px-4 py-3 align-top">
+                  <p className="font-medium text-slate-800 dark:text-slate-200">{resolveEventName(item.event)}</p>
+                  {item.event?.slug ? (
+                    <p className="text-xs text-slate-500 dark:text-slate-500">{item.event.slug}</p>
+                  ) : null}
+                </td>
+                <td className="px-4 py-3 align-top">
+                  <p className="font-semibold text-slate-900 dark:text-slate-100">
+                    {formatCurrency(item.amount, item.currency ?? 'EUR')}
+                  </p>
+                  {item.receipt_url ? (
+                    <a
+                      href={item.receipt_url}
+                      target="_blank"
+                      rel="noreferrer"
+                      className="text-xs text-sky-600 hover:text-sky-700 dark:text-sky-300 dark:hover:text-sky-200"
+                    >
+                      {t('billing.sections.transactions.labels.receipt')}
+                    </a>
+                  ) : null}
+                </td>
+                <td className="px-4 py-3 align-top">
+                  <Badge className={statusTone[item.status] ?? 'bg-slate-200 text-slate-700 dark:bg-slate-800 dark:text-slate-200'}>
+                    {statusLabel}
+                  </Badge>
+                </td>
+                <td className="px-4 py-3 align-top text-sm text-slate-600 dark:text-slate-300">{purchasedLabel}</td>
+              </tr>
+            );
+          })}
+        </tbody>
+      </table>
+    </FrostedSurface>
+  );
+}
+
 function TransactionCard({
   transaction,
   formatCurrency,
diff --git a/resources/js/admin/pages/EventDetailPage.tsx b/resources/js/admin/pages/EventDetailPage.tsx
index 68cb335..e6c040f 100644
--- a/resources/js/admin/pages/EventDetailPage.tsx
+++ b/resources/js/admin/pages/EventDetailPage.tsx
@@ -1,5 +1,5 @@
 import React from 'react';
-import { useNavigate, useParams } from 'react-router-dom';
+import { useNavigate, useParams, useSearchParams } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
 import {
   AlertTriangle,
@@ -16,6 +16,7 @@ import {
   RefreshCw,
   Smile,
   Sparkles,
+  ShoppingCart,
   Users,
 } from 'lucide-react';
 import toast from 'react-hot-toast';
@@ -36,6 +37,7 @@ import {
   toggleEvent,
   submitTenantFeedback,
   updatePhotoVisibility,
+  createEventAddonCheckout,
 } from '../api';
 import { buildLimitWarnings } from '../lib/limitWarnings';
 import { getApiErrorMessage } from '../lib/apiError';
@@ -54,6 +56,9 @@ import {
   ActionGrid,
   TenantHeroCard,
 } from '../components/tenant';
+import { AddonsPicker } from '../components/Addons/AddonsPicker';
+import { AddonSummaryList } from '../components/Addons/AddonSummaryList';
+import { EventAddonCatalogItem, getAddonCatalog } from '../api';
 import { GuestBroadcastCard } from '../components/GuestBroadcastCard';
 
 type EventDetailPageProps = {
@@ -76,6 +81,7 @@ type WorkspaceState = {
 
 export default function EventDetailPage({ mode = 'detail' }: EventDetailPageProps) {
   const { slug: slugParam } = useParams<{ slug?: string }>();
+  const [searchParams] = useSearchParams();
   const navigate = useNavigate();
   const { t } = useTranslation('management');
   const { t: tCommon } = useTranslation('common');
@@ -91,6 +97,9 @@ export default function EventDetailPage({ mode = 'detail' }: EventDetailPageProp
   });
 
   const [toolkit, setToolkit] = React.useState<ToolkitState>({ data: null, loading: true, error: null });
+  const [addonBusyId, setAddonBusyId] = React.useState<string | null>(null);
+  const [addonRefreshCount, setAddonRefreshCount] = React.useState(0);
+  const [addonsCatalog, setAddonsCatalog] = React.useState<EventAddonCatalogItem[]>([]);
 
   const load = React.useCallback(async () => {
     if (!slug) {
@@ -103,8 +112,9 @@ export default function EventDetailPage({ mode = 'detail' }: EventDetailPageProp
     setToolkit((prev) => ({ ...prev, loading: true, error: null }));
 
     try {
-      const [eventData, statsData] = await Promise.all([getEvent(slug), getEventStats(slug)]);
+      const [eventData, statsData, addonOptions] = await Promise.all([getEvent(slug), getEventStats(slug), getAddonCatalog()]);
       setState((prev) => ({ ...prev, event: eventData, stats: statsData, loading: false }));
+      setAddonsCatalog(addonOptions);
     } catch (error) {
       if (!isAuthError(error)) {
         setState((prev) => ({
@@ -181,7 +191,43 @@ export default function EventDetailPage({ mode = 'detail' }: EventDetailPageProp
     [event?.limits, tCommon],
   );
 
-  const shownWarningToasts = React.useRef<Set<string>>(new Set());
+const shownWarningToasts = React.useRef<Set<string>>(new Set());
+  const [addonBusyId, setAddonBusyId] = React.useState<string | null>(null);
+
+  const handleAddonPurchase = React.useCallback(
+    async (scope: 'photos' | 'guests' | 'gallery', addonKeyOverride?: string) => {
+      if (!slug) return;
+
+      const defaultAddons: Record<typeof scope, string> = {
+        photos: 'extra_photos_500',
+        guests: 'extra_guests_100',
+        gallery: 'extend_gallery_30d',
+      };
+
+      const addonKey = addonKeyOverride ?? defaultAddons[scope];
+      setAddonBusyId(scope);
+      try {
+        const currentUrl = window.location.origin + window.location.pathname;
+        const successUrl = `${currentUrl}?addon_success=1`;
+        const checkout = await createEventAddonCheckout(slug, {
+          addon_key: addonKey,
+          quantity: 1,
+          success_url: successUrl,
+          cancel_url: currentUrl,
+        });
+        if (checkout.checkout_url) {
+          window.location.href = checkout.checkout_url;
+        } else {
+          toast(t('events.errors.checkoutMissing', 'Checkout konnte nicht gestartet werden.'));
+        }
+      } catch (err) {
+        toast(getApiErrorMessage(err, t('events.errors.checkoutFailed', 'Add-on Checkout fehlgeschlagen.')));
+      } finally {
+        setAddonBusyId(null);
+      }
+    },
+    [slug, t],
+  );
 
   React.useEffect(() => {
     limitWarnings.forEach((warning) => {
@@ -198,6 +244,30 @@ export default function EventDetailPage({ mode = 'detail' }: EventDetailPageProp
     });
   }, [limitWarnings]);
 
+  React.useEffect(() => {
+    const success = searchParams.get('addon_success');
+    if (success && slug) {
+      toast(t('events.success.addonApplied', 'Add-on angewendet. Limits aktualisieren sich in Kürze.'));
+      void load();
+      setAddonRefreshCount(3);
+      const params = new URLSearchParams(window.location.search);
+      params.delete('addon_success');
+      const search = params.toString();
+      navigate(search ? `${window.location.pathname}?${search}` : window.location.pathname, { replace: true });
+    }
+  }, [searchParams, slug, load, navigate, t]);
+
+  React.useEffect(() => {
+    if (addonRefreshCount <= 0) {
+      return;
+    }
+    const timer = setTimeout(() => {
+      void load();
+      setAddonRefreshCount((count) => count - 1);
+    }, 8000);
+    return () => clearTimeout(timer);
+  }, [addonRefreshCount, load]);
+
   if (!slug) {
     return (
       <AdminLayout
@@ -230,10 +300,39 @@ export default function EventDetailPage({ mode = 'detail' }: EventDetailPageProp
               variant={warning.tone === 'danger' ? 'destructive' : 'default'}
               className={warning.tone === 'warning' ? 'border-amber-400/40 bg-amber-50 text-amber-900' : undefined}
             >
-              <AlertDescription className="flex items-center gap-2 text-sm">
-                <AlertTriangle className="h-4 w-4" />
-                {warning.message}
-              </AlertDescription>
+              <div className="flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between">
+                <AlertDescription className="flex items-center gap-2 text-sm">
+                  <AlertTriangle className="h-4 w-4" />
+                  {warning.message}
+                </AlertDescription>
+                {(['photos', 'guests', 'gallery'] as const).includes(warning.scope) ? (
+                  <div className="flex flex-col gap-2 sm:flex-row sm:items-center sm:gap-3">
+                    <Button
+                      variant="outline"
+                      size="sm"
+                      onClick={() => { void handleAddonPurchase(warning.scope as 'photos' | 'guests' | 'gallery'); }}
+                      disabled={addonBusyId === warning.scope}
+                      className="justify-start"
+                    >
+                      <ShoppingCart className="mr-2 h-4 w-4" />
+                      {warning.scope === 'photos'
+                        ? t('events.actions.buyMorePhotos', 'Mehr Fotos freischalten')
+                        : warning.scope === 'guests'
+                          ? t('events.actions.buyMoreGuests', 'Mehr Gäste freischalten')
+                          : t('events.actions.extendGallery', 'Galerie verlängern')}
+                    </Button>
+                    {addonsCatalog.length > 0 ? (
+                      <AddonsPicker
+                        addons={addonsCatalog}
+                        scope={warning.scope as 'photos' | 'guests' | 'gallery'}
+                        onCheckout={(key) => { void handleAddonPurchase(warning.scope as 'photos' | 'guests' | 'gallery', key); }}
+                        busy={addonBusyId === warning.scope}
+                        t={(key, fallback) => t(key as any, fallback)}
+                      />
+                    ) : null}
+                  </div>
+                ) : null}
+              </div>
             </Alert>
           ))}
         </div>
@@ -257,7 +356,17 @@ export default function EventDetailPage({ mode = 'detail' }: EventDetailPageProp
             navigate={navigate}
           />
 
-          {(toolkitData?.alerts?.length ?? 0) > 0 && <AlertList alerts={toolkitData?.alerts ?? []} />}
+      {(toolkitData?.alerts?.length ?? 0) > 0 && <AlertList alerts={toolkitData?.alerts ?? []} />}
+
+      {state.event?.addons?.length ? (
+        <SectionCard>
+          <SectionHeader
+            title={t('events.sections.addons.title', 'Add-ons & Upgrades')}
+            description={t('events.sections.addons.description', 'Zusätzliche Kontingente für dieses Event.')}
+          />
+          <AddonSummaryList addons={state.event.addons} t={(key, fallback) => t(key, fallback)} />
+        </SectionCard>
+      ) : null}
 
           <div className="grid gap-6 xl:grid-cols-[minmax(0,1.6fr)_minmax(0,0.6fr)]">
             <StatusCard event={event} stats={stats} busy={busy} onToggle={handleToggle} />
diff --git a/resources/js/admin/pages/EventInvitesPage.tsx b/resources/js/admin/pages/EventInvitesPage.tsx
index 58b695c..f9fd9c5 100644
--- a/resources/js/admin/pages/EventInvitesPage.tsx
+++ b/resources/js/admin/pages/EventInvitesPage.tsx
@@ -1,7 +1,7 @@
 import React from 'react';
 import { useNavigate, useParams, useSearchParams } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
-import { AlertTriangle, ArrowLeft, Copy, Download, Loader2, Printer, QrCode, RefreshCw, Share2, X } from 'lucide-react';
+import { AlertTriangle, ArrowLeft, Copy, Download, Loader2, Printer, QrCode, RefreshCw, Share2, X, ShoppingCart } from 'lucide-react';
 
 import { Alert, AlertDescription, AlertTitle } from '@/components/ui/alert';
 import { Badge } from '@/components/ui/badge';
@@ -9,6 +9,7 @@ import { Button } from '@/components/ui/button';
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
 import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
+import toast from 'react-hot-toast';
 
 import { AdminLayout } from '../components/AdminLayout';
 import {
@@ -20,6 +21,9 @@ import {
   TenantEvent,
   updateEventQrInvite,
   EventQrInviteLayout,
+  createEventAddonCheckout,
+  getAddonCatalog,
+  type EventAddonCatalogItem,
 } from '../api';
 import { isAuthError } from '../auth/tokens';
 import {
@@ -29,6 +33,8 @@ import {
   ADMIN_EVENT_PHOTOS_PATH,
 } from '../constants';
 import { buildLimitWarnings } from '../lib/limitWarnings';
+import { AddonsPicker } from '../components/Addons/AddonsPicker';
+import { AddonSummaryList } from '../components/Addons/AddonSummaryList';
 import { InviteLayoutCustomizerPanel, QrLayoutCustomization } from './components/InviteLayoutCustomizerPanel';
 import { buildDownloadFilename, normalizeEventDateSegment } from './components/invite-layout/fileNames';
 import { DesignerCanvas } from './components/invite-layout/DesignerCanvas';
@@ -191,9 +197,14 @@ export default function EventInvitesPage(): React.ReactElement {
 
     setState((prev) => ({ ...prev, loading: true, error: null }));
     try {
-      const [eventData, invitesData] = await Promise.all([getEvent(slug), getEventQrInvites(slug)]);
+      const [eventData, invitesData, catalog] = await Promise.all([
+        getEvent(slug),
+        getEventQrInvites(slug),
+        getAddonCatalog(),
+      ]);
       setState({ event: eventData, invites: invitesData, loading: false, error: null });
       setSelectedInviteId((current) => current ?? invitesData[0]?.id ?? null);
+      setAddonsCatalog(catalog);
     } catch (error) {
       if (!isAuthError(error)) {
         setState({ event: null, invites: [], loading: false, error: 'QR-Einladungen konnten nicht geladen werden.' });
@@ -765,6 +776,36 @@ export default function EventInvitesPage(): React.ReactElement {
     [state.event?.limits, tLimits]
   );
 
+  const [addonBusy, setAddonBusy] = React.useState<string | null>(null);
+  const [addonsCatalog, setAddonsCatalog] = React.useState<EventAddonCatalogItem[]>([]);
+  const [searchParams] = useSearchParams();
+
+  const handleAddonPurchase = React.useCallback(
+    async (addonKey?: string) => {
+      if (!slug) return;
+      setAddonBusy('guests');
+      const key = addonKey ?? 'extra_guests_100';
+      try {
+        const currentUrl = window.location.origin + window.location.pathname;
+        const successUrl = `${currentUrl}?addon_success=1`;
+        const checkout = await createEventAddonCheckout(slug, {
+          addon_key: key,
+          quantity: 1,
+          success_url: successUrl,
+          cancel_url: currentUrl,
+        });
+        if (checkout.checkout_url) {
+          window.location.href = checkout.checkout_url;
+        }
+      } catch (err) {
+        toast(getApiErrorMessage(err, 'Checkout fehlgeschlagen.'));
+      } finally {
+        setAddonBusy(null);
+      }
+    },
+    [slug],
+  );
+
   const limitScopeLabels = React.useMemo(
     () => ({
       photos: tLimits('photosTitle'),
@@ -774,6 +815,16 @@ export default function EventInvitesPage(): React.ReactElement {
     [tLimits]
   );
 
+  React.useEffect(() => {
+    const success = searchParams.get('addon_success');
+    if (success && slug) {
+      toast(t('events.success.addonApplied', 'Add-on angewendet. Limits aktualisieren sich in Kürze.'));
+      void load();
+      searchParams.delete('addon_success');
+      navigate(window.location.pathname, { replace: true });
+    }
+  }, [searchParams, slug, load, navigate, t]);
+
   return (
     <AdminLayout
       title={eventName}
@@ -788,18 +839,54 @@ export default function EventInvitesPage(): React.ReactElement {
               variant={warning.tone === 'danger' ? 'destructive' : 'default'}
               className={warning.tone === 'warning' ? 'border-amber-400/50 bg-amber-50 text-amber-900' : undefined}
             >
-              <AlertTitle className="flex items-center gap-2 text-sm font-semibold">
-                <AlertTriangle className="h-4 w-4" />
-                {limitScopeLabels[warning.scope]}
-              </AlertTitle>
-              <AlertDescription className="text-sm">
-                {warning.message}
-              </AlertDescription>
+              <div className="flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between">
+                <div>
+                  <AlertTitle className="flex items-center gap-2 text-sm font-semibold">
+                    <AlertTriangle className="h-4 w-4" />
+                    {limitScopeLabels[warning.scope]}
+                  </AlertTitle>
+                  <AlertDescription className="text-sm">
+                    {warning.message}
+                  </AlertDescription>
+                </div>
+                {warning.scope === 'guests' ? (
+                  <div className="flex flex-col gap-2 sm:flex-row sm:items-center sm:gap-3">
+                    <Button
+                      variant="outline"
+                      size="sm"
+                      onClick={() => { void handleAddonPurchase(); }}
+                      disabled={addonBusy === 'guests'}
+                    >
+                      <ShoppingCart className="mr-2 h-4 w-4" />
+                      {t('invites.actions.buyMoreGuests', 'Mehr Gäste freischalten')}
+                    </Button>
+                    <AddonsPicker
+                      addons={addonsCatalog}
+                      scope="guests"
+                      onCheckout={(key) => { void handleAddonPurchase(key); }}
+                      busy={addonBusy === 'guests'}
+                      t={(key, fallback) => t(key as any, fallback)}
+                    />
+                  </div>
+                ) : null}
+              </div>
             </Alert>
           ))}
         </div>
       )}
 
+      {state.event?.addons?.length ? (
+        <Card className="mb-6 border-0 bg-white/85 shadow-lg shadow-slate-100/50">
+          <CardHeader>
+            <CardTitle className="text-base font-semibold text-slate-900">{t('events.sections.addons.title', 'Add-ons & Upgrades')}</CardTitle>
+            <CardDescription>{t('events.sections.addons.description', 'Zusätzliche Kontingente für dieses Event.')}</CardDescription>
+          </CardHeader>
+          <CardContent>
+            <AddonSummaryList addons={state.event.addons} t={(key, fallback) => t(key as any, fallback)} />
+          </CardContent>
+        </Card>
+      ) : null}
+
       <Tabs value={activeTab} onValueChange={handleTabChange} className="space-y-6">
         <TabsList className="grid w-full max-w-2xl grid-cols-3 gap-1 rounded-full border border-[var(--tenant-border-strong)] bg-[var(--tenant-surface-strong)] p-1 text-sm">
           <TabsTrigger value="layout" className="rounded-full px-4 py-1.5 data-[state=active]:bg-primary data-[state=active]:text-primary-foreground">
diff --git a/resources/js/admin/pages/EventPhotosPage.tsx b/resources/js/admin/pages/EventPhotosPage.tsx
index 1e16f5a..be2c7eb 100644
--- a/resources/js/admin/pages/EventPhotosPage.tsx
+++ b/resources/js/admin/pages/EventPhotosPage.tsx
@@ -1,13 +1,17 @@
 import React from 'react';
 import { useNavigate, useParams, useSearchParams } from 'react-router-dom';
-import { Camera, Loader2, Sparkles, Trash2, AlertTriangle } from 'lucide-react';
+import { Camera, Loader2, Sparkles, Trash2, AlertTriangle, ShoppingCart } from 'lucide-react';
 
 import { Alert, AlertDescription, AlertTitle } from '@/components/ui/alert';
 import { Button } from '@/components/ui/button';
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
+import toast from 'react-hot-toast';
+import { AddonsPicker } from '../components/Addons/AddonsPicker';
+import { AddonSummaryList } from '../components/Addons/AddonSummaryList';
+import { getAddonCatalog, getEvent, type EventAddonCatalogItem, type EventAddonSummary } from '../api';
 
 import { AdminLayout } from '../components/AdminLayout';
-import { deletePhoto, featurePhoto, getEventPhotos, TenantPhoto, unfeaturePhoto } from '../api';
+import { createEventAddonCheckout, deletePhoto, featurePhoto, getEventPhotos, TenantPhoto, unfeaturePhoto } from '../api';
 import { isAuthError } from '../auth/tokens';
 import { getApiErrorMessage, isApiError } from '../lib/apiError';
 import { buildLimitWarnings, type EventLimitSummary } from '../lib/limitWarnings';
@@ -31,6 +35,10 @@ export default function EventPhotosPage() {
   const [error, setError] = React.useState<string | undefined>(undefined);
   const [busyId, setBusyId] = React.useState<number | null>(null);
   const [limits, setLimits] = React.useState<EventLimitSummary | null>(null);
+  const [addons, setAddons] = React.useState<EventAddonCatalogItem[]>([]);
+  const [catalogError, setCatalogError] = React.useState<string | undefined>(undefined);
+  const [searchParams, setSearchParams] = React.useState(() => new URLSearchParams(window.location.search));
+  const [eventAddons, setEventAddons] = React.useState<EventAddonSummary[]>([]);
 
   const load = React.useCallback(async () => {
     if (!slug) {
@@ -40,9 +48,16 @@ export default function EventPhotosPage() {
     setLoading(true);
     setError(undefined);
     try {
-      const result = await getEventPhotos(slug);
-      setPhotos(result.photos);
-      setLimits(result.limits ?? null);
+      const [photoResult, eventData, catalog] = await Promise.all([
+        getEventPhotos(slug),
+        getEvent(slug),
+        getAddonCatalog(),
+      ]);
+      setPhotos(photoResult.photos);
+      setLimits(photoResult.limits ?? null);
+      setEventAddons(eventData.addons ?? []);
+      setAddons(catalog);
+      setCatalogError(undefined);
     } catch (err) {
       if (!isAuthError(err)) {
         setError(getApiErrorMessage(err, 'Fotos konnten nicht geladen werden.'));
@@ -56,6 +71,18 @@ export default function EventPhotosPage() {
     load();
   }, [load]);
 
+  React.useEffect(() => {
+    const success = searchParams.get('addon_success');
+    if (success && slug) {
+      toast(translateLimits('addonApplied', { defaultValue: 'Add-on angewendet. Limits aktualisieren sich in Kürze.' }));
+      void load();
+      const params = new URLSearchParams(searchParams);
+      params.delete('addon_success');
+      setSearchParams(params);
+      navigate(window.location.pathname, { replace: true });
+    }
+  }, [searchParams, slug, load, navigate, translateLimits]);
+
   async function handleToggleFeature(photo: TenantPhoto) {
     if (!slug) return;
     setBusyId(photo.id);
@@ -126,7 +153,19 @@ export default function EventPhotosPage() {
         </Alert>
       )}
 
-      <LimitWarningsBanner limits={limits} translate={translateLimits} />
+      <LimitWarningsBanner limits={limits} translate={translateLimits} eventSlug={slug} addons={addons} />
+
+      {eventAddons.length > 0 && (
+        <Card className="mb-6 border-0 bg-white/85 shadow-lg shadow-slate-100/50">
+          <CardHeader>
+            <CardTitle className="text-base font-semibold text-slate-900">{t('events.sections.addons.title', 'Add-ons & Upgrades')}</CardTitle>
+            <CardDescription>{t('events.sections.addons.description', 'Zusätzliche Kontingente für dieses Event.')}</CardDescription>
+          </CardHeader>
+          <CardContent>
+            <AddonSummaryList addons={eventAddons} t={(key, fallback) => t(key as any, fallback)} />
+          </CardContent>
+        </Card>
+      )}
 
       <Card className="border-0 bg-white/85 shadow-xl shadow-sky-100/60">
         <CardHeader>
@@ -197,11 +236,49 @@ export default function EventPhotosPage() {
 function LimitWarningsBanner({
   limits,
   translate,
+  eventSlug,
+  addons,
 }: {
   limits: EventLimitSummary | null;
   translate: (key: string, options?: Record<string, unknown>) => string;
+  eventSlug: string | null;
+  addons: EventAddonCatalogItem[];
 }) {
   const warnings = React.useMemo(() => buildLimitWarnings(limits, translate), [limits, translate]);
+  const [busyScope, setBusyScope] = React.useState<string | null>(null);
+
+  const handleCheckout = React.useCallback(
+    async (scopeOrKey: 'photos' | 'gallery' | string) => {
+      if (!eventSlug) return;
+      const scope = scopeOrKey === 'gallery' || scopeOrKey === 'photos' ? scopeOrKey : (scopeOrKey.includes('gallery') ? 'gallery' : 'photos');
+      setBusyScope(scope);
+      const addonKey = scopeOrKey === 'photos' || scopeOrKey === 'gallery'
+        ? (() => {
+            const fallbackKey = scope === 'photos' ? 'extra_photos_500' : 'extend_gallery_30d';
+            const candidates = addons.filter((addon) => addon.price_id && addon.key.includes(scope === 'photos' ? 'photos' : 'gallery'));
+            return candidates[0]?.key ?? fallbackKey;
+          })()
+        : scopeOrKey;
+      try {
+        const currentUrl = window.location.origin + window.location.pathname;
+        const successUrl = `${currentUrl}?addon_success=1`;
+        const checkout = await createEventAddonCheckout(eventSlug, {
+          addon_key: addonKey,
+          quantity: 1,
+          success_url: successUrl,
+          cancel_url: currentUrl,
+        });
+        if (checkout.checkout_url) {
+          window.location.href = checkout.checkout_url;
+        }
+      } catch (err) {
+        toast(getApiErrorMessage(err, 'Checkout fehlgeschlagen.'));
+      } finally {
+        setBusyScope(null);
+      }
+    },
+    [eventSlug, addons],
+  );
 
   if (!warnings.length) {
     return null;
@@ -215,10 +292,36 @@ function LimitWarningsBanner({
           variant={warning.tone === 'danger' ? 'destructive' : 'default'}
           className={warning.tone === 'warning' ? 'border-amber-400/40 bg-amber-50 text-amber-900' : undefined}
         >
-          <AlertDescription className="flex items-center gap-2 text-sm">
-            <AlertTriangle className="h-4 w-4" />
-            {warning.message}
-          </AlertDescription>
+          <div className="flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between">
+            <AlertDescription className="flex items-center gap-2 text-sm">
+              <AlertTriangle className="h-4 w-4" />
+              {warning.message}
+            </AlertDescription>
+            {warning.scope === 'photos' || warning.scope === 'gallery' ? (
+              <div className="flex flex-col gap-2 sm:flex-row sm:items-center sm:gap-3">
+                <Button
+                  variant="outline"
+                  size="sm"
+                  onClick={() => { void handleCheckout(warning.scope as 'photos' | 'gallery'); }}
+                  disabled={busyScope === warning.scope}
+                >
+                  <ShoppingCart className="mr-2 h-4 w-4" />
+                  {warning.scope === 'photos'
+                    ? translate('buyMorePhotos', { defaultValue: 'Mehr Fotos freischalten' })
+                    : translate('extendGallery', { defaultValue: 'Galerie verlängern' })}
+                </Button>
+                <div className="text-xs text-slate-500">
+                  <AddonsPicker
+                    addons={addons}
+                    scope={warning.scope as 'photos' | 'gallery'}
+                    onCheckout={(key) => { void handleCheckout(key); }}
+                    busy={busyScope === warning.scope}
+                    t={(key, fallback) => translate(key, { defaultValue: fallback })}
+                  />
+                </div>
+              </div>
+            ) : null}
+          </div>
         </Alert>
       ))}
     </div>
diff --git a/resources/lang/de/emails.php b/resources/lang/de/emails.php
index c6e82e0..e929d18 100644
--- a/resources/lang/de/emails.php
+++ b/resources/lang/de/emails.php
@@ -71,6 +71,8 @@ return [
             'subject' => 'Foto-Uploads für „:event“ sind aktuell blockiert',
             'greeting' => 'Hallo :name,',
             'body' => 'Das Paket „:package“ für das Event „:event“ hat das Maximum von :limit Fotos erreicht. Gäste können keine neuen Fotos hochladen, bis Sie das Paket upgraden.',
+            'cta_addon' => 'Brauchen Sie sofort mehr Uploads? Nutzen Sie das Add-on im Event-Dashboard, um zusätzliche Slots in Sekunden freizuschalten.',
+            'addon_action' => 'Mehr Fotos freischalten',
             'action' => 'Paket verwalten oder upgraden',
         ],
         'guest_threshold' => [
@@ -83,6 +85,8 @@ return [
             'subject' => 'Gästekontingent für „:event“ ist ausgeschöpft',
             'greeting' => 'Hallo :name,',
             'body' => 'Das Paket „:package“ für das Event „:event“ hat das Maximum von :limit Gästen erreicht. Neue Gästelinks können erst nach einem Upgrade erstellt werden.',
+            'cta_addon' => 'Benötigen Sie sofort mehr Gästeplätze? Nutzen Sie das Add-on im Event-Dashboard, um direkt neue Slots freizuschalten.',
+            'addon_action' => 'Mehr Gäste freischalten',
             'action' => 'Paket verwalten oder upgraden',
         ],
         'event_threshold' => [
@@ -129,4 +133,15 @@ return [
         ],
         'footer' => 'Viele Grüße<br>Ihr Fotospiel-Team',
     ],
+
+    'addons' => [
+        'receipt' => [
+            'subject' => 'Add-on gekauft: :addon',
+            'greeting' => 'Hallo :name,',
+            'body' => 'Sie haben „ :addon “ für das Event „ :event “ gebucht. Betrag: :amount.',
+            'summary' => 'Enthalten: +:photos Fotos, +:guests Gäste, +:days Tage Galerie.',
+            'unknown_amount' => 'k.A.',
+            'action' => 'Event-Dashboard öffnen',
+        ],
+    ],
 ];
diff --git a/resources/lang/en/emails.php b/resources/lang/en/emails.php
index fe9c356..f84f369 100644
--- a/resources/lang/en/emails.php
+++ b/resources/lang/en/emails.php
@@ -71,7 +71,9 @@ return [
             'subject' => 'Photo uploads for ":event" are currently blocked',
             'greeting' => 'Hello :name,',
             'body' => 'The package ":package" for event ":event" has reached its maximum of :limit photos. Guests can no longer upload new photos until you upgrade the package.',
+            'cta_addon' => 'Need more uploads right now? Use the in-app add-on to unlock additional photo slots instantly.',
             'action' => 'Upgrade or manage package',
+            'addon_action' => 'Unlock more photos',
         ],
         'guest_threshold' => [
             'subject' => 'Event ":event" has used :percentage% of its guest allowance',
@@ -83,7 +85,9 @@ return [
             'subject' => 'Guest slots for ":event" are currently exhausted',
             'greeting' => 'Hello :name,',
             'body' => 'The package ":package" for event ":event" has reached its maximum of :limit guests. New guest invites cannot be created until you upgrade the package.',
+            'cta_addon' => 'Need more guest access right away? Use the add-on button inside the event dashboard to unlock extra slots within seconds.',
             'action' => 'Upgrade or manage package',
+            'addon_action' => 'Unlock more guests',
         ],
         'event_threshold' => [
             'subject' => 'Package ":package" has used :percentage% of its event allowance',
@@ -129,4 +133,15 @@ return [
         ],
         'footer' => 'Best regards,<br>The Fotospiel Team',
     ],
+
+    'addons' => [
+        'receipt' => [
+            'subject' => 'Add-on purchase: :addon',
+            'greeting' => 'Hello :name,',
+            'body' => 'You purchased " :addon " for the event " :event ". Amount: :amount.',
+            'summary' => 'Included: +:photos photos, +:guests guests, +:days gallery days.',
+            'unknown_amount' => 'n/a',
+            'action' => 'Open event dashboard',
+        ],
+    ],
 ];
diff --git a/resources/views/emails/addons/receipt.blade.php b/resources/views/emails/addons/receipt.blade.php
new file mode 100644
index 0000000..783f217
--- /dev/null
+++ b/resources/views/emails/addons/receipt.blade.php
@@ -0,0 +1,44 @@
+@php
+    /** @var \App\Models\EventPackageAddon $addon */
+    $event = $addon->event;
+    $tenant = $event?->tenant;
+    $label = $addon->metadata['label'] ?? $addon->addon_key;
+    $amount = $addon->amount ? number_format((float) $addon->amount, 2).' '.($addon->currency ?? 'EUR') : __('emails.addons.receipt.unknown_amount');
+    $summary = [];
+    if ($addon->extra_photos > 0) {
+        $summary[] = __('emails.addons.receipt.summary.photos', ['count' => number_format($addon->extra_photos)]);
+    }
+    if ($addon->extra_guests > 0) {
+        $summary[] = __('emails.addons.receipt.summary.guests', ['count' => number_format($addon->extra_guests)]);
+    }
+    if ($addon->extra_gallery_days > 0) {
+        $summary[] = __('emails.addons.receipt.summary.gallery', ['count' => $addon->extra_gallery_days]);
+    }
+@endphp
+
+@component('mail::message')
+# {{ __('emails.addons.receipt.subject', ['addon' => $label]) }}
+
+{{ __('emails.addons.receipt.greeting', ['name' => $tenant?->name ?? __('emails.package_limits.team_fallback')]) }}
+
+{{ __('emails.addons.receipt.body', [
+    'addon' => $label,
+    'event' => $event?->name['de'] ?? $event?->name['en'] ?? $event?->name ?? __('emails.package_limits.event_fallback'),
+    'amount' => $amount,
+]) }}
+
+@if(!empty($summary))
+**{{ __('emails.addons.receipt.summary_title', 'Included:') }}**
+
+@foreach($summary as $line)
+- {{ $line }}
+@endforeach
+@endif
+
+@component('mail::button', ['url' => url('/tenant/events/'.($event?->slug ?? ''))])
+{{ __('emails.addons.receipt.action') }}
+@endcomponent
+
+{{ __('emails.package_limits.footer') }}
+
+@endcomponent
diff --git a/routes/api.php b/routes/api.php
index ac8372b..60dcc88 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -7,6 +7,8 @@ use App\Http\Controllers\Api\Marketing\CouponPreviewController;
 use App\Http\Controllers\Api\PackageController;
 use App\Http\Controllers\Api\Tenant\DashboardController;
 use App\Http\Controllers\Api\Tenant\EmotionController;
+use App\Http\Controllers\Api\Tenant\EventAddonCatalogController;
+use App\Http\Controllers\Api\Tenant\EventAddonController;
 use App\Http\Controllers\Api\Tenant\EventController;
 use App\Http\Controllers\Api\Tenant\EventGuestNotificationController;
 use App\Http\Controllers\Api\Tenant\EventJoinTokenController;
@@ -148,6 +150,8 @@ Route::prefix('v1')->name('api.v1.')->group(function () {
                 Route::get('toolkit', [EventController::class, 'toolkit'])->name('tenant.events.toolkit');
                 Route::get('guest-notifications', [EventGuestNotificationController::class, 'index'])->name('tenant.events.guest-notifications.index');
                 Route::post('guest-notifications', [EventGuestNotificationController::class, 'store'])->name('tenant.events.guest-notifications.store');
+                Route::post('addons/apply', [EventAddonController::class, 'apply'])->name('tenant.events.addons.apply');
+                Route::post('addons/checkout', [EventAddonController::class, 'checkout'])->name('tenant.events.addons.checkout');
             });
 
             Route::prefix('join-tokens')->group(function () {
@@ -266,13 +270,25 @@ Route::prefix('v1')->name('api.v1.')->group(function () {
             Route::post('/paddle-checkout', [PackageController::class, 'createPaddleCheckout'])->name('packages.paddle-checkout');
         });
 
+        Route::get('addons/catalog', [EventAddonCatalogController::class, 'index'])
+            ->middleware('tenant.admin')
+            ->name('tenant.addons.catalog');
+
         Route::prefix('tenant/packages')->middleware('tenant.admin')->group(function () {
             Route::get('/', [TenantPackageController::class, 'index'])->name('tenant.packages.index');
         });
 
-        Route::get('tenant/billing/transactions', [TenantBillingController::class, 'transactions'])
-            ->middleware('tenant.admin')
-            ->name('tenant.billing.transactions');
+        Route::prefix('billing')->middleware('tenant.admin')->group(function () {
+            Route::get('transactions', [TenantBillingController::class, 'transactions'])
+                ->name('tenant.billing.transactions');
+            Route::get('addons', [TenantBillingController::class, 'addons'])
+                ->name('tenant.billing.addons');
+        });
+
+        Route::prefix('tenant/billing')->middleware('tenant.admin')->group(function () {
+            Route::get('transactions', [TenantBillingController::class, 'transactions']);
+            Route::get('addons', [TenantBillingController::class, 'addons']);
+        });
 
         Route::post('feedback', [TenantFeedbackController::class, 'store'])
             ->name('tenant.feedback.store');
diff --git a/tests/Feature/Api/Tenant/BillingAddonHistoryTest.php b/tests/Feature/Api/Tenant/BillingAddonHistoryTest.php
new file mode 100644
index 0000000..3767d63
--- /dev/null
+++ b/tests/Feature/Api/Tenant/BillingAddonHistoryTest.php
@@ -0,0 +1,102 @@
+<?php
+
+namespace Tests\Feature\Api\Tenant;
+
+use App\Models\Event;
+use App\Models\EventPackage;
+use App\Models\EventPackageAddon;
+use App\Models\Package;
+use App\Models\Tenant;
+use Tests\Feature\Tenant\TenantTestCase;
+
+class BillingAddonHistoryTest extends TenantTestCase
+{
+    public function test_tenant_can_list_addon_history(): void
+    {
+        $package = Package::factory()->endcustomer()->create([
+            'max_photos' => 500,
+            'max_guests' => 200,
+            'gallery_days' => 60,
+        ]);
+
+        $event = Event::factory()->for($this->tenant)->create([
+            'name' => ['de' => 'Gala', 'en' => 'Gala'],
+        ]);
+
+        $eventPackage = EventPackage::create([
+            'event_id' => $event->id,
+            'package_id' => $package->id,
+            'purchased_price' => $package->price,
+            'purchased_at' => now()->subMonth(),
+            'used_photos' => 0,
+            'used_guests' => 0,
+            'gallery_expires_at' => now()->addDays(30),
+        ]);
+
+        $firstAddon = EventPackageAddon::create([
+            'event_package_id' => $eventPackage->id,
+            'event_id' => $event->id,
+            'tenant_id' => $this->tenant->id,
+            'addon_key' => 'extra_guests_50',
+            'quantity' => 1,
+            'extra_guests' => 50,
+            'status' => 'completed',
+            'amount' => 99.00,
+            'currency' => 'EUR',
+            'metadata' => ['label' => '+50 Gäste'],
+            'purchased_at' => now()->subDay(),
+            'receipt_payload' => ['receipt_url' => 'https://receipt.example/first'],
+        ]);
+
+        $secondAddon = EventPackageAddon::create([
+            'event_package_id' => $eventPackage->id,
+            'event_id' => $event->id,
+            'tenant_id' => $this->tenant->id,
+            'addon_key' => 'extra_photos_200',
+            'quantity' => 2,
+            'extra_photos' => 200,
+            'extra_guests' => 0,
+            'status' => 'pending',
+            'amount' => 149.00,
+            'currency' => 'EUR',
+            'metadata' => ['label' => '+200 Fotos'],
+            'purchased_at' => now(),
+            'receipt_payload' => ['receipt_url' => 'https://receipt.example/second'],
+        ]);
+
+        $otherTenant = Tenant::factory()->create();
+        $otherEvent = Event::factory()->for($otherTenant)->create();
+        $otherPackage = EventPackage::create([
+            'event_id' => $otherEvent->id,
+            'package_id' => $package->id,
+            'purchased_price' => $package->price,
+            'purchased_at' => now()->subWeek(),
+            'used_photos' => 0,
+            'used_guests' => 0,
+            'gallery_expires_at' => now()->addDays(30),
+        ]);
+
+        EventPackageAddon::create([
+            'event_package_id' => $otherPackage->id,
+            'event_id' => $otherEvent->id,
+            'tenant_id' => $otherTenant->id,
+            'addon_key' => 'extra_guests_999',
+            'quantity' => 1,
+            'extra_guests' => 999,
+            'status' => 'completed',
+            'amount' => 100.00,
+            'currency' => 'EUR',
+            'purchased_at' => now(),
+        ]);
+
+        $response = $this->authenticatedRequest('GET', '/api/v1/tenant/billing/addons');
+
+        $response->assertOk();
+        $response->assertJsonCount(2, 'data');
+        $response->assertJsonPath('meta.total', 2);
+        $response->assertJsonPath('data.0.id', $secondAddon->id);
+        $response->assertJsonPath('data.0.receipt_url', 'https://receipt.example/second');
+        $response->assertJsonPath('data.0.event.slug', $event->slug);
+        $response->assertJsonPath('data.1.id', $firstAddon->id);
+    }
+}
diff --git a/tests/Feature/Api/Tenant/EventAddonsSummaryTest.php b/tests/Feature/Api/Tenant/EventAddonsSummaryTest.php
new file mode 100644
index 0000000..5242182
--- /dev/null
+++ b/tests/Feature/Api/Tenant/EventAddonsSummaryTest.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace Tests\Feature\Api\Tenant;
+
+use App\Models\Event;
+use App\Models\EventPackage;
+use App\Models\EventPackageAddon;
+use App\Models\Package;
+use Tests\Feature\Tenant\TenantTestCase;
+
+class EventAddonsSummaryTest extends TenantTestCase
+{
+    public function test_event_resource_includes_addons(): void
+    {
+        $package = Package::factory()->endcustomer()->create([
+            'max_guests' => 50,
+            'max_photos' => 100,
+        ]);
+
+        $event = Event::factory()->for($this->tenant)->create([
+            'status' => 'published',
+        ]);
+
+        $eventPackage = EventPackage::create([
+            'event_id' => $event->id,
+            'package_id' => $package->id,
+            'purchased_price' => $package->price,
+            'purchased_at' => now(),
+            'used_photos' => 0,
+            'used_guests' => 0,
+            'gallery_expires_at' => now()->addDays(30),
+            'extra_guests' => 20,
+        ]);
+
+        EventPackageAddon::create([
+            'event_package_id' => $eventPackage->id,
+            'event_id' => $event->id,
+            'tenant_id' => $this->tenant->id,
+            'addon_key' => 'extra_guests_100',
+            'quantity' => 1,
+            'extra_guests' => 100,
+            'status' => 'completed',
+            'purchased_at' => now(),
+        ]);
+
+        $response = $this->authenticatedRequest('GET', "/api/v1/tenant/events/{$event->slug}");
+
+        $response->assertOk();
+        $response->assertJsonPath('data.addons.0.key', 'extra_guests_100');
+        $response->assertJsonPath('data.addons.0.extra_guests', 100);
+    }
+}
diff --git a/tests/Feature/Tenant/EventAddonCheckoutTest.php b/tests/Feature/Tenant/EventAddonCheckoutTest.php
new file mode 100644
index 0000000..51d6860
--- /dev/null
+++ b/tests/Feature/Tenant/EventAddonCheckoutTest.php
@@ -0,0 +1,81 @@
+<?php
+
+namespace Tests\Feature\Tenant;
+
+use App\Models\Event;
+use App\Models\EventPackage;
+use App\Models\EventPackageAddon;
+use App\Models\Package;
+use Illuminate\Support\Facades\Config;
+use Illuminate\Support\Facades\Http;
+
+class EventAddonCheckoutTest extends TenantTestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        Config::set('package-addons.extra_photos_small', [
+            'label' => 'Extra photos (500)',
+            'price_id' => 'pri_addon_photos',
+            'increments' => ['extra_photos' => 500],
+        ]);
+
+        Config::set('paddle.api_key', 'test_key');
+        Config::set('paddle.base_url', 'https://paddle.test');
+        Config::set('paddle.environment', 'sandbox');
+
+        // Fake Paddle response
+        Http::fake([
+            '*/checkout/links' => Http::response([
+                'data' => [
+                    'url' => 'https://checkout.paddle.test/abcd',
+                    'id' => 'chk_addon_123',
+                    'expires_at' => now()->addHour()->toIso8601String(),
+                ],
+            ], 200),
+        ]);
+    }
+
+    public function test_checkout_creates_pending_addon_record(): void
+    {
+        $package = Package::factory()->endcustomer()->create([
+            'max_photos' => 100,
+            'max_guests' => 50,
+            'gallery_days' => 7,
+        ]);
+
+        $event = Event::factory()->for($this->tenant)->create([
+            'status' => 'published',
+        ]);
+
+        $eventPackage = EventPackage::create([
+            'event_id' => $event->id,
+            'package_id' => $package->id,
+            'purchased_price' => $package->price,
+            'purchased_at' => now(),
+            'used_photos' => 0,
+            'used_guests' => 0,
+            'gallery_expires_at' => now()->addDays(7),
+        ]);
+
+        $response = $this->authenticatedRequest('POST', "/api/v1/tenant/events/{$event->slug}/addons/checkout", [
+            'addon_key' => 'extra_photos_small',
+            'quantity' => 2,
+        ]);
+
+        $response->assertOk();
+        $response->assertJsonPath('checkout_id', 'chk_addon_123');
+
+        $this->assertDatabaseHas('event_package_addons', [
+            'event_package_id' => $eventPackage->id,
+            'addon_key' => 'extra_photos_small',
+            'status' => 'pending',
+            'quantity' => 2,
+            'checkout_id' => 'chk_addon_123',
+        ]);
+
+        $addon = EventPackageAddon::where('event_package_id', $eventPackage->id)->latest()->first();
+        $this->assertSame(1000, $addon->extra_photos); // increments * quantity
+    }
+}
diff --git a/tests/Feature/Tenant/EventAddonControllerTest.php b/tests/Feature/Tenant/EventAddonControllerTest.php
new file mode 100644
index 0000000..a1332a8
--- /dev/null
+++ b/tests/Feature/Tenant/EventAddonControllerTest.php
@@ -0,0 +1,78 @@
+<?php
+
+namespace Tests\Feature\Tenant;
+
+use App\Models\Event;
+use App\Models\EventPackage;
+use App\Models\Package;
+use Carbon\Carbon;
+
+class EventAddonControllerTest extends TenantTestCase
+{
+    public function test_tenant_admin_can_apply_addons(): void
+    {
+        $package = Package::factory()->endcustomer()->create([
+            'max_photos' => 100,
+            'max_guests' => 50,
+            'gallery_days' => 7,
+        ]);
+
+        $event = Event::factory()->for($this->tenant)->create([
+            'status' => 'published',
+        ]);
+
+        $eventPackage = EventPackage::create([
+            'event_id' => $event->id,
+            'package_id' => $package->id,
+            'purchased_price' => $package->price,
+            'purchased_at' => now()->subDay(),
+            'used_photos' => 10,
+            'used_guests' => 5,
+            'gallery_expires_at' => Carbon::now()->addDays(7),
+        ]);
+
+        $originalExpiry = $eventPackage->gallery_expires_at->copy();
+
+        $response = $this->authenticatedRequest('POST', "/api/v1/tenant/events/{$event->slug}/addons/apply", [
+            'extra_photos' => 50,
+            'extra_guests' => 25,
+            'extend_gallery_days' => 3,
+            'reason' => 'Manual boost for event',
+        ]);
+
+        $response->assertOk();
+        $response->assertJsonPath('data.limits.photos.limit', 150);
+        $response->assertJsonPath('data.limits.guests.limit', 75);
+
+        $eventPackage->refresh();
+
+        $this->assertSame(50, $eventPackage->extra_photos);
+        $this->assertSame(25, $eventPackage->extra_guests);
+        $this->assertSame(3, $eventPackage->extra_gallery_days);
+        $this->assertTrue($eventPackage->gallery_expires_at->isSameDay($originalExpiry->addDays(3)));
+    }
+
+    public function test_validation_fails_when_no_addons_provided(): void
+    {
+        $package = Package::factory()->endcustomer()->create();
+
+        $event = Event::factory()->for($this->tenant)->create([
+            'status' => 'published',
+        ]);
+
+        EventPackage::create([
+            'event_id' => $event->id,
+            'package_id' => $package->id,
+            'purchased_price' => $package->price,
+            'purchased_at' => now(),
+            'used_photos' => 0,
+            'used_guests' => 0,
+            'gallery_expires_at' => now()->addDays(7),
+        ]);
+
+        $response = $this->authenticatedRequest('POST', "/api/v1/tenant/events/{$event->slug}/addons/apply", []);
+
+        $response->assertStatus(422);
+        $response->assertJsonValidationErrors('addons');
+    }
+}
diff --git a/tests/Feature/Tenant/EventAddonWebhookTest.php b/tests/Feature/Tenant/EventAddonWebhookTest.php
new file mode 100644
index 0000000..3b2493a
--- /dev/null
+++ b/tests/Feature/Tenant/EventAddonWebhookTest.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace Tests\Feature\Tenant;
+
+use App\Models\Event;
+use App\Models\EventPackage;
+use App\Models\EventPackageAddon;
+use App\Models\Package;
+use App\Notifications\Addons\AddonPurchaseReceipt;
+use App\Services\Addons\EventAddonWebhookService;
+use Illuminate\Support\Facades\Config;
+use Illuminate\Support\Facades\Notification;
+
+class EventAddonWebhookTest extends TenantTestCase
+{
+    public function test_webhook_applies_addon_and_marks_completed(): void
+    {
+        Notification::fake();
+
+        Config::set('package-addons.extra_guests', [
+            'label' => 'Guests 100',
+            'increments' => ['extra_guests' => 100],
+            'price_id' => 'pri_guests',
+        ]);
+
+        $package = Package::factory()->endcustomer()->create([
+            'max_guests' => 50,
+        ]);
+
+        $event = Event::factory()->for($this->tenant)->create([
+            'status' => 'published',
+        ]);
+
+        $eventPackage = EventPackage::create([
+            'event_id' => $event->id,
+            'package_id' => $package->id,
+            'purchased_price' => $package->price,
+            'purchased_at' => now(),
+            'used_photos' => 0,
+            'used_guests' => 0,
+            'gallery_expires_at' => now()->addDays(7),
+        ]);
+
+        $addon = EventPackageAddon::create([
+            'event_package_id' => $eventPackage->id,
+            'event_id' => $event->id,
+            'tenant_id' => $this->tenant->id,
+            'addon_key' => 'extra_guests',
+            'quantity' => 1,
+            'extra_guests' => 100,
+            'status' => 'pending',
+            'metadata' => [
+                'addon_intent' => 'intent-123',
+            ],
+        ]);
+
+        $payload = [
+            'event_type' => 'transaction.completed',
+            'data' => [
+                'id' => 'txn_addon_1',
+                'metadata' => [
+                    'addon_intent' => 'intent-123',
+                    'addon_key' => 'extra_guests',
+                ],
+            ],
+        ];
+
+        $handler = app(EventAddonWebhookService::class);
+
+        $handled = $handler->handle($payload);
+
+        $this->assertTrue($handled);
+
+        $addon->refresh();
+        $eventPackage->refresh();
+
+        $this->assertSame('completed', $addon->status);
+        $this->assertSame('txn_addon_1', $addon->transaction_id);
+        $this->assertSame(100, $eventPackage->extra_guests);
+
+        Notification::assertSentTimes(AddonPurchaseReceipt::class, 1);
+    }
+}
diff --git a/tests/Unit/Jobs/SyncPackageAddonToPaddleTest.php b/tests/Unit/Jobs/SyncPackageAddonToPaddleTest.php
new file mode 100644
index 0000000..8bc30fd
--- /dev/null
+++ b/tests/Unit/Jobs/SyncPackageAddonToPaddleTest.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace Tests\Unit\Jobs;
+
+use App\Jobs\SyncPackageAddonToPaddle;
+use App\Models\PackageAddon;
+use App\Services\Paddle\PaddleAddonCatalogService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Mockery;
+use Tests\TestCase;
+
+class SyncPackageAddonToPaddleTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_creates_and_updates_price_and_product(): void
+    {
+        $addon = PackageAddon::create([
+            'key' => 'extra_photos_500',
+            'label' => '+500 Fotos',
+            'extra_photos' => 500,
+            'metadata' => ['price_eur' => 5],
+        ]);
+
+        $service = Mockery::mock(PaddleAddonCatalogService::class);
+        $service->shouldReceive('createProduct')
+            ->once()
+            ->andReturn(['id' => 'pro_addon_1']);
+        $service->shouldReceive('createPrice')
+            ->once()
+            ->andReturn(['id' => 'pri_addon_1']);
+
+        $job = new SyncPackageAddonToPaddle($addon->id);
+        $job->handle($service);
+
+        $addon->refresh();
+
+        $this->assertSame('pri_addon_1', $addon->price_id);
+        $this->assertEquals('pro_addon_1', $addon->metadata['paddle_product_id']);
+        $this->assertEquals('synced', $addon->metadata['paddle_sync_status']);
+    }
+}
diff --git a/tests/Unit/Services/EventAddonCatalogTest.php b/tests/Unit/Services/EventAddonCatalogTest.php
new file mode 100644
index 0000000..c068436
--- /dev/null
+++ b/tests/Unit/Services/EventAddonCatalogTest.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Tests\Unit\Services;
+
+use App\Models\PackageAddon;
+use App\Services\Addons\EventAddonCatalog;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Config;
+use Tests\TestCase;
+
+class EventAddonCatalogTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_prefers_database_addons_over_config(): void
+    {
+        Config::set('package-addons', [
+            'extra_photos_small' => [
+                'label' => 'Config Photos',
+                'price_id' => 'pri_config',
+                'increments' => ['extra_photos' => 100],
+            ],
+        ]);
+
+        PackageAddon::create([
+            'key' => 'extra_photos_small',
+            'label' => 'DB Photos',
+            'price_id' => 'pri_db',
+            'extra_photos' => 200,
+            'active' => true,
+            'sort' => 1,
+        ]);
+
+        $catalog = $this->app->make(EventAddonCatalog::class);
+
+        $addon = $catalog->find('extra_photos_small');
+
+        $this->assertNotNull($addon);
+        $this->assertSame('DB Photos', $addon['label']);
+        $this->assertSame('pri_db', $addon['price_id']);
+        $this->assertSame(200, $addon['increments']['extra_photos']);
+    }
+}
diff --git a/tests/Unit/Services/PackageLimitEvaluatorTest.php b/tests/Unit/Services/PackageLimitEvaluatorTest.php
index dc8d616..fdcc8bc 100644
--- a/tests/Unit/Services/PackageLimitEvaluatorTest.php
+++ b/tests/Unit/Services/PackageLimitEvaluatorTest.php
@@ -165,4 +165,40 @@ class PackageLimitEvaluatorTest extends TestCase
         $this->assertTrue($summary['can_upload_photos']);
         $this->assertTrue($summary['can_add_guests']);
     }
+
+    public function test_assess_photo_upload_respects_extra_limits(): void
+    {
+        $package = Package::factory()->endcustomer()->create([
+            'max_photos' => 5,
+        ]);
+
+        $tenant = Tenant::factory()->create();
+
+        $event = Event::factory()
+            ->for($tenant)
+            ->create();
+
+        $eventPackage = EventPackage::create([
+            'event_id' => $event->id,
+            'package_id' => $package->id,
+            'purchased_price' => $package->price,
+            'purchased_at' => now(),
+            'used_photos' => 5,
+            'used_guests' => 0,
+            'gallery_expires_at' => now()->addDays(14),
+            'extra_photos' => 5,
+        ])->fresh(['package']);
+
+        $violation = $this->evaluator->assessPhotoUpload($tenant->fresh(), $event->id);
+
+        $this->assertNull($violation, 'Upload should be allowed within extra photo allowance');
+
+        $eventPackage->update(['used_photos' => 10]);
+
+        $violation = $this->evaluator->assessPhotoUpload($tenant->fresh(), $event->id);
+
+        $this->assertNotNull($violation, 'Upload should be blocked after exceeding base + extras');
+        $this->assertSame('photo_limit_exceeded', $violation['code']);
+        $this->assertSame(0, $violation['meta']['remaining']);
+    }
 }
diff --git a/tests/Unit/Services/PackageUsageTrackerTest.php b/tests/Unit/Services/PackageUsageTrackerTest.php
index a735490..74164de 100644
--- a/tests/Unit/Services/PackageUsageTrackerTest.php
+++ b/tests/Unit/Services/PackageUsageTrackerTest.php
@@ -145,4 +145,41 @@ class PackageUsageTrackerTest extends TestCase
 
         EventFacade::assertDispatched(EventPackageGuestLimitReached::class);
     }
+
+    public function test_effective_limits_include_extras(): void
+    {
+        EventFacade::fake([
+            EventPackagePhotoLimitReached::class,
+        ]);
+
+        $tenant = Tenant::factory()->create();
+        $package = Package::factory()->endcustomer()->create([
+            'max_photos' => 2,
+        ]);
+        $event = Event::factory()->for($tenant)->create();
+
+        $eventPackage = EventPackage::create([
+            'event_id' => $event->id,
+            'package_id' => $package->id,
+            'purchased_price' => $package->price,
+            'purchased_at' => now(),
+            'used_photos' => 2,
+            'used_guests' => 0,
+            'gallery_expires_at' => now()->addDays(7),
+            'extra_photos' => 2,
+        ])->fresh(['package']);
+
+        /** @var PackageUsageTracker $tracker */
+        $tracker = app(PackageUsageTracker::class);
+
+        // Base limit reached but extras still available; no limit event expected yet.
+        $tracker->recordPhotoUsage($eventPackage, 1, 1);
+        EventFacade::assertNotDispatched(EventPackagePhotoLimitReached::class);
+
+        // Now consume extras and hit the effective limit.
+        $eventPackage->used_photos = 4;
+        $tracker->recordPhotoUsage($eventPackage, 3, 1);
+
+        EventFacade::assertDispatched(EventPackagePhotoLimitReached::class);
+    }
 }