Add PayPal support for add-on and gift voucher checkout

app/Http/Controllers/Api/Tenant/EventAddonCatalogController.php

@@ -3,6 +3,7 @@
 namespace App\Http\Controllers\Api\Tenant;
 
 use App\Http\Controllers\Controller;
+use App\Models\CheckoutSession;
 use App\Services\Addons\EventAddonCatalog;
 use Illuminate\Http\JsonResponse;
 
@@ -12,9 +13,25 @@ class EventAddonCatalogController extends Controller
 
     public function index(): JsonResponse
     {
+        $provider = config('package-addons.provider')
+            ?? config('checkout.default_provider', CheckoutSession::PROVIDER_PAYPAL);
+
         $addons = collect($this->catalog->all())
-            ->filter(fn (array $addon) => ! empty($addon['variant_id']))
-            ->map(fn (array $addon, string $key) => array_merge($addon, ['key' => $key]))
+            ->map(function (array $addon, string $key) use ($provider): array {
+                $priceId = $provider === CheckoutSession::PROVIDER_PAYPAL
+                    ? ($addon['price'] ?? null ? 'paypal' : null)
+                    : ($addon['variant_id'] ?? null);
+
+                return [
+                    'key' => $key,
+                    'label' => $addon['label'] ?? null,
+                    'price_id' => $priceId,
+                    'increments' => $addon['increments'] ?? [],
+                    'price' => $addon['price'] ?? null,
+                    'currency' => $addon['currency'] ?? 'EUR',
+                ];
+            })
+            ->filter(fn (array $addon) => ! empty($addon['price_id']))
             ->values()
             ->all();