completed velocity integration

lib/screens/integration/integration_controller.dart

@@ -1,8 +1,8 @@
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import 'package:provider/provider.dart';
 import 'package:qpay/http/http.dart';
+import 'package:qpay/models/api_response.dart';
 import 'package:qpay/screens/gateway/gateway_controller.dart';
 import 'package:qpay/screens/transaction_controller.dart';
 import 'package:shared_preferences/shared_preferences.dart';
@@ -34,19 +34,7 @@ class IntegrationController extends ChangeNotifier {
     gatewayController = GatewayController(context);
   }
 
-  void _showErrorSnackBar(String? message) {
-    WidgetsBinding.instance.addPostFrameCallback((_) {
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(
-          content: Text(message.toString()),
-          behavior: SnackBarBehavior.floating,
-          backgroundColor: Colors.deepOrange,
-        ),
-      );
-    });
-  }
-
-  Future<void> doIntegration() async {
+  Future<ApiResponse<Map<String, dynamic>>> doIntegration() async {
     try {
       model.isLoading = true;
       notifyListeners();
@@ -75,10 +63,13 @@ class IntegrationController extends ChangeNotifier {
       WidgetsBinding.instance.addPostFrameCallback((_) {
         if (!_disposed && context.mounted) context.go('/receipt');
       });
+
+      return ApiResponse.success(Map<String, dynamic>.from(response));
     } catch (e) {
       model.isLoading = false;
       model.errorMessage = e.toString();
       if (!_disposed) notifyListeners();
+      return ApiResponse.failure(e.toString());
     }
   }