completed velocity integration

lib/screens/pay/pay_controller.dart

@@ -4,6 +4,7 @@ import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:provider/provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:qpay/http/http.dart';
+import 'package:qpay/models/api_response.dart';
 import 'package:qpay/screens/home/home_controller.dart' as hc;
 import 'package:qpay/screens/transaction_controller.dart';
 import 'package:qpay/screens/transaction_controller.dart' as tc;
@@ -69,21 +70,9 @@ class PayController extends ChangeNotifier {
     model.selectedProduct = transactionController.model.selectedProduct;
   }
 
-  void _showErrorSnackBar(String? message) {
-    WidgetsBinding.instance.addPostFrameCallback((_) {
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(
-          content: Text(message.toString()),
-          behavior: SnackBarBehavior.floating,
-          backgroundColor: Colors.deepOrange,
-        ),
-      );
-    });
-  }
-
   // formData can come from a repeat transaction
   // otherwise build it from elements of the normal flow
-  Future<void> doTransaction([tc.FormData? formData]) async {
+  Future<ApiResponse<Map<String, dynamic>>> doTransaction([tc.FormData? formData]) async {
     try {
       model.isLoading = true;
       notifyListeners();
@@ -120,52 +109,59 @@ class PayController extends ChangeNotifier {
 
       dynamic response = workflowResponse['body'];
 
+      model.isLoading = false;
+      notifyListeners();
+
       if (response['status'] == 'SUCCESS') {
         model.status = response['status'];
-
         transactionController.updateConfirmationData(response);
+        return ApiResponse.success(Map<String, dynamic>.from(response));
       } else {
         model.status = response['status'];
         model.errorMessage =
             response['errorMessage'] ??
             "Problem with the transaction. Please try again or contact support";
-        _showErrorSnackBar(model.errorMessage);
+        return ApiResponse.failure(model.errorMessage!);
       }
     } on DioException catch (e, s) {
       logger.e(s);
-      _showErrorSnackBar("Network error. Please try again or contact support");
+      model.isLoading = false;
+      notifyListeners();
+      return ApiResponse.failure("Network error. Please try again or contact support");
     } catch (e, s) {
       logger.e(s);
-      _showErrorSnackBar(
+      model.isLoading = false;
+      notifyListeners();
+      return ApiResponse.failure(
         "Problem processing that transaction. Please try again or contact support",
       );
     }
-
-    model.isLoading = false;
-    notifyListeners();
   }
 
-  Future<void> getProducts(String providerId) async {
-    // model.products = getFakeProducts();
+  Future<ApiResponse<List<BillProduct>>> getProducts(String providerId) async {
     try {
       model.isLoading = true;
+      notifyListeners();
 
       List<dynamic> response = await http.get(
         '/public/providers/$providerId/products',
       );
       model.products = response.map((e) => BillProduct.fromJson(e)).toList();
+
+      model.isLoading = false;
+      notifyListeners();
+      return ApiResponse.success(model.products);
     } catch (e) {
       logger.e(e);
-      _showErrorSnackBar(
+      model.isLoading = false;
+      notifyListeners();
+      return ApiResponse.failure(
         "Problem fetching products, are you connected to the internet?",
       );
     }
-
-    model.isLoading = false;
-    notifyListeners();
   }
 
-  Future<void> getPaymentProcessors() async {
+  Future<ApiResponse<List<PaymentProcessor>>> getPaymentProcessors() async {
     try {
       model.isLoading = true;
       model.paymentProcessors = getFakePaymentProcessors();
@@ -175,10 +171,14 @@ class PayController extends ChangeNotifier {
       model.paymentProcessors =
           response.map((e) => PaymentProcessor.fromJson(e)).toList();
 
+      model.isLoading = false;
       notifyListeners();
+      return ApiResponse.success(model.paymentProcessors);
     } catch (e) {
       logger.e(e);
-      _showErrorSnackBar(
+      model.isLoading = false;
+      notifyListeners();
+      return ApiResponse.failure(
         "Problem fetching payment processors, are you connected to the internet?",
       );
     }