feat: enhance FastRequest functionality with shift scheduling and improve payment callback handling

app/Http/Controllers/Client/PaymentController.php

@@ -17,6 +17,7 @@ use App\Services\Payment\ZibalPaymentService;
 use App\Services\Wallet\WalletService;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\DB;
 
 class PaymentController extends Controller
 {
@@ -68,7 +69,7 @@ class PaymentController extends Controller
         }
 
         if ($wasPending && $payment->status === PaymentStatusEnum::Paid) {
-            $this->settle($payment);
+            DB::transaction(fn () => $this->settle($payment));
         }
 
         session()->flash('payment_result', [