updated document upload according to fresh api

frontend/pshared/lib/models/payment/execution_operation.dart

@@ -1,6 +1,7 @@
 class PaymentExecutionOperation {
   final String? stepRef;
   final String? operationRef;
+  final String? gateway;
   final String? code;
   final String? state;
   final String? label;
@@ -12,6 +13,7 @@ class PaymentExecutionOperation {
   const PaymentExecutionOperation({
     required this.stepRef,
     required this.operationRef,
+    required this.gateway,
     required this.code,
     required this.state,
     required this.label,

frontend/pshared/lib/models/payment/operation.dart

@@ -1,7 +1,6 @@
 import 'package:pshared/models/payment/methods/type.dart';
 import 'package:pshared/models/payment/status.dart';
 
-
 class OperationItem {
   final OperationStatus status;
   final String? fileName;
@@ -11,6 +10,8 @@ class OperationItem {
   final String toCurrency;
   final String payId;
   final String? paymentRef;
+  final String? operationRef;
+  final String? gatewayService;
   final String? cardNumber;
   final PaymentMethod? paymentMethod;
   final String name;
@@ -26,6 +27,8 @@ class OperationItem {
     required this.toCurrency,
     required this.payId,
     this.paymentRef,
+    this.operationRef,
+    this.gatewayService,
     this.cardNumber,
     this.paymentMethod,
     required this.name,