implemented hotrecharge changes

lib/screens/integration/integration_controller.dart

@@ -1,4 +1,3 @@
-
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
@@ -22,6 +21,8 @@ class IntegrationController extends ChangeNotifier {
   late GatewayController gatewayController;
   late SharedPreferences prefs;
 
+  bool _disposed = false;
+
   BuildContext context;
 
   IntegrationController(this.context) {
@@ -45,15 +46,14 @@ class IntegrationController extends ChangeNotifier {
     });
   }
 
-
   Future<void> doIntegration() async {
     try {
       model.isLoading = true;
       notifyListeners();
 
       dynamic workflowResponse = await http.get(
-          '/public/transaction/integration/'
-              '${transactionController.model.confirmationData['id']}'
+        '/public/transaction/integration/'
+        '${transactionController.model.confirmationData['id']}',
       );
       logger.i(workflowResponse.toString());
 
@@ -63,21 +63,28 @@ class IntegrationController extends ChangeNotifier {
         model.status = response['status'];
         transactionController.updateReceiptData(response);
 
-        await gatewayController.poll(transactionController.model.confirmationData['id']);
+        await gatewayController.poll(
+          transactionController.model.confirmationData['id'],
+        );
       }
 
       // regardless of poll result we proceed to receipt
-      WidgetsBinding.instance.addPostFrameCallback((_) {
-        context.go('/receipt');
-      });
-
       model.isLoading = false;
-      notifyListeners();
+      if (!_disposed) notifyListeners();
 
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        if (!_disposed && context.mounted) context.go('/receipt');
+      });
     } catch (e) {
       model.isLoading = false;
       model.errorMessage = e.toString();
-      notifyListeners();
+      if (!_disposed) notifyListeners();
     }
   }
-}
+
+  @override
+  void dispose() {
+    _disposed = true;
+    super.dispose();
+  }
+}