Add PayPal webhook handling

app/Http/Controllers/PayPalReturnController.php

@@ -5,6 +5,7 @@ namespace App\Http\Controllers;
 use App\Models\CheckoutSession;
 use App\Services\Checkout\CheckoutAssignmentService;
 use App\Services\Checkout\CheckoutSessionService;
+use App\Services\Coupons\CouponRedemptionService;
 use App\Services\PayPal\Exceptions\PayPalException;
 use App\Services\PayPal\PayPalOrderService;
 use Illuminate\Http\RedirectResponse;
@@ -18,6 +19,7 @@ class PayPalReturnController extends Controller
         private readonly PayPalOrderService $orders,
         private readonly CheckoutSessionService $sessions,
         private readonly CheckoutAssignmentService $assignment,
+        private readonly CouponRedemptionService $couponRedemptions,
     ) {}
 
     public function __invoke(Request $request): RedirectResponse
@@ -57,6 +59,7 @@ class PayPalReturnController extends Controller
             ]);
 
             $this->sessions->markFailed($session, 'paypal_capture_failed');
+            $this->couponRedemptions->recordFailure($session, 'paypal_capture_failed');
 
             return redirect()->to($this->resolveSafeRedirect($cancelUrl, $fallback));
         }
@@ -89,11 +92,13 @@ class PayPalReturnController extends Controller
             ]);
 
             $this->sessions->markCompleted($session, now());
+            $this->couponRedemptions->recordSuccess($session, $capture);
 
             return redirect()->to($this->resolveSafeRedirect($successUrl, $fallback));
         }
 
         $this->sessions->markFailed($session, 'paypal_'.$status);
+        $this->couponRedemptions->recordFailure($session, 'paypal_'.$status);
 
         return redirect()->to($this->resolveSafeRedirect($cancelUrl, $fallback));
     }