fixes on onboarding flow

lib/screens/integration/integration_controller.dart

@@ -0,0 +1,75 @@
+
+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/screens/transaction_controller.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class IntegrationModel {
+  Map<String, dynamic>? transaction;
+  String status = '';
+  bool isLoading = false;
+  String? errorMessage;
+}
+
+class IntegrationController extends ChangeNotifier {
+  final IntegrationModel model = IntegrationModel();
+  final Http http = Http();
+  late TransactionController transactionController;
+  late SharedPreferences prefs;
+
+  BuildContext context;
+
+  IntegrationController(this.context) {
+    transactionController = Provider.of<TransactionController>(
+      context,
+      listen: false,
+    );
+  }
+
+  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 {
+    try {
+      model.isLoading = true;
+      model.status = '';
+      notifyListeners();
+
+      dynamic workflowResponse = await http.get(
+          '/public/transaction/integration/'
+              '${transactionController.model.confirmationData['id']}'
+      );
+      logger.i(workflowResponse.toString());
+
+      dynamic response = workflowResponse['body'];
+
+      if (response['status'] == 'SUCCESS') {
+        model.status = response['status'];
+        transactionController.updateReceiptData(response);
+      } else {
+        model.status = response['status'];
+        model.errorMessage = response['errorMessage'];
+        _showErrorSnackBar(response['errorMessage']);
+      }
+      notifyListeners();
+
+    } catch (e) {
+      model.isLoading = false;
+      model.errorMessage = e.toString();
+      notifyListeners();
+    }
+  }
+}