Brackets!

app/Http/Controllers/Admin/PaymentController.php

@@ -102,13 +102,16 @@ class PaymentController extends Controller
                                 ]
                         ]
                     ]
-                ],
+                ]
+            ],
             "application_context" => [
                 "cancel_url" => route('payment.cancel'),
                 "return_url" => route('payment.success', ['product' => $paypalProduct->id]),
                 'brand_name' =>  config('app.name', 'Laravel'),
                 'shipping_preference'  => 'NO_SHIPPING'
             ]
+
+        
         ];