fixes on tran flow

lib/screens/gateway/gateway_controller.dart

@@ -62,17 +62,18 @@ class GatewayController extends ChangeNotifier {
       model.status = response['status'];
       transactionController.model.paymentStatus = response['paymentStatus'];
 
+      finishLoading();
       if(model.status == 'SUCCESS') {
         transactionController.updateReceiptData(response);
       }
       notifyListeners();
     } catch (e) {
+      finishLoading();
       logger.e(e);
       _showErrorSnackBar(
         "Network error. Please try again or contact support",
       );
     }
-    finishLoading();
   }
 
   Future<void> pollTransaction(String uid) async {