Checkout‑Registrierung validiert jetzt die E‑Mail‑Länge, und die Checkout‑Flows sind Paddle‑only: Stripe‑Endpoints/

Services/Helpers sind entfernt, API/Frontend angepasst, Tests auf Paddle umgestellt. Außerdem wurde die CSP gestrafft
  und Stripe‑Texte in den Abandoned‑Checkout‑Mails ersetzt.

app/Jobs/ValidateStripeWebhookJob.php

@@ -1,98 +0,0 @@
-<?php
-
-namespace App\Jobs;
-
-use App\Models\EventPurchase;
-use App\Models\Tenant;
-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\Facades\DB;
-use Illuminate\Support\Facades\Log;
-
-class ValidateStripeWebhookJob implements ShouldQueue
-{
-    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
-
-    public $payload;
-    public $sig;
-    public $tries = 3;
-    public $backoff = [60, 300, 600]; // Retry delays
-
-    public function __construct($payload, $sig)
-    {
-        $this->payload = $payload;
-        $this->sig = $sig;
-    }
-
-    public function handle()
-    {
-        $secret = config('services.stripe.webhook');
-
-        if (!$secret) {
-            Log::error('No Stripe webhook secret configured');
-            return;
-        }
-
-        $expectedSig = 'v1=' . hash_hmac('sha256', $this->payload, $secret);
-
-        if (!hash_equals($expectedSig, $this->sig)) {
-            Log::error('Invalid signature in Stripe webhook job');
-            return;
-        }
-
-        $event = json_decode($this->payload, true);
-
-        if (json_last_error() !== JSON_ERROR_NONE) {
-            Log::error('Invalid JSON in Stripe webhook job: ' . json_last_error_msg());
-            return;
-        }
-
-        if ($event['type'] === 'checkout.session.completed') {
-            $session = $event['data']['object'];
-            $receiptId = $session['id'];
-
-            if (EventPurchase::where('external_receipt_id', $receiptId)->exists()) {
-                return;
-            }
-
-            $tenantId = $session['metadata']['tenant_id'] ?? null;
-
-            if (!$tenantId) {
-                Log::warning('No tenant_id in Stripe metadata job', ['receipt_id' => $receiptId]);
-                return;
-            }
-
-            $tenant = Tenant::find($tenantId);
-
-            if (!$tenant) {
-                Log::error('Tenant not found in Stripe webhook job', ['tenant_id' => $tenantId]);
-                return;
-            }
-
-            $amount = $session['amount_total'] / 100;
-            $currency = $session['currency'];
-            $eventsPurchased = (int) ($session['metadata']['events_purchased'] ?? 1);
-
-            DB::transaction(function () use ($tenant, $amount, $currency, $eventsPurchased, $receiptId) {
-                $purchase = EventPurchase::create([
-                    'tenant_id' => $tenant->id,
-                    'events_purchased' => $eventsPurchased,
-                    'amount' => $amount,
-                    'currency' => $currency,
-                    'provider' => 'stripe',
-                    'external_receipt_id' => $receiptId,
-                    'status' => 'completed',
-                    'purchased_at' => now(),
-                ]);
-
-            });
-
-            Log::info('Processed Stripe purchase via job', ['receipt_id' => $receiptId, 'tenant_id' => $tenantId]);
-        } else {
-            Log::info('Unhandled Stripe event in job', ['type' => $event['type']]);
-        }
-    }
-}