added android logo assets

lib/screens/pay/pay_controller.dart

@@ -20,6 +20,7 @@ class PayScreenModel {
   PaymentProcessor? selectedPaymentProcessor;
   String region = '';
   bool isLoading = false;
+  bool isLoadingProducts = false;
   String? errorMessage;
   String? status;
 }
@@ -146,7 +147,7 @@ class PayController extends ChangeNotifier {
 
   Future<ApiResponse<List<BillProduct>>> getProducts(String providerId) async {
     try {
-      model.isLoading = true;
+      model.isLoadingProducts = true;
       notifyListeners();
 
       List<dynamic> response = await http.get(
@@ -154,12 +155,12 @@ class PayController extends ChangeNotifier {
       );
       model.products = response.map((e) => BillProduct.fromJson(e)).toList();
 
-      model.isLoading = false;
+      model.isLoadingProducts = false;
       notifyListeners();
       return ApiResponse.success(model.products);
     } catch (e) {
       logger.e(e);
-      model.isLoading = false;
+      model.isLoadingProducts = false;
       notifyListeners();
       return ApiResponse.failure(
         "Problem fetching products, are you connected to the internet?",