pass around estimate instead of just rateId

lib/models/exchange/incomplete_exchange.dart

@@ -1,5 +1,6 @@
 import 'package:decimal/decimal.dart';
 import 'package:flutter/foundation.dart';
+import 'package:stackwallet/models/exchange/response_objects/estimate.dart';
 import 'package:stackwallet/models/exchange/response_objects/trade.dart';
 import 'package:stackwallet/utilities/enums/exchange_rate_type_enum.dart';
 
@@ -39,13 +40,13 @@ class IncompleteExchangeModel extends ChangeNotifier {
     }
   }
 
-  String? _rateId;
+  Estimate? _estimate;
 
-  String? get rateId => _rateId;
+  Estimate? get estimate => _estimate;
 
-  set rateId(String? rateId) {
+  set estimate(Estimate? estimate) {
-    if (_rateId != rateId) {
+    if (_estimate != estimate) {
-      _rateId = rateId;
+      _estimate = estimate;
       notifyListeners();
     }
   }
@@ -70,6 +71,6 @@ class IncompleteExchangeModel extends ChangeNotifier {
     required this.rateType,
     required this.reversed,
     required this.walletInitiated,
-    String? rateId,
+    Estimate? estimate,
-  }) : _rateId = rateId;
+  }) : _estimate = estimate;
 }

lib/models/exchange/response_objects/estimate.dart

@@ -7,6 +7,7 @@ class Estimate {
   final bool reversed;
   final String? warningMessage;
   final String? rateId;
+  final String? exchangeProvider;
 
   Estimate({
     required this.estimatedAmount,
@@ -14,6 +15,7 @@ class Estimate {
     required this.reversed,
     this.warningMessage,
     this.rateId,
+    this.exchangeProvider,
   });
 
   factory Estimate.fromMap(Map<String, dynamic> map) {
@@ -38,6 +40,7 @@ class Estimate {
       "reversed": reversed,
       "warningMessage": warningMessage,
       "rateId": rateId,
+      "exchangeProvider": exchangeProvider,
     };
   }
 

lib/pages/exchange_view/exchange_form.dart

@@ -554,7 +554,7 @@ class _ExchangeFormState extends ConsumerState<ExchangeForm> {
           ? ref.read(exchangeFormStateProvider).receiveAmount!
           : estimate.estimatedAmount,
       rateType: rateType,
-      rateId: estimate.rateId,
+      estimate: estimate,
       reversed: estimate.reversed,
       walletInitiated: walletInitiated,
     );

lib/pages/exchange_view/exchange_step_views/step_3_view.dart

@@ -271,24 +271,26 @@ class _Step3ViewState extends ConsumerState<Step3View> {
                                                   ? model.refundAddress!
                                                   : "",
                                               refundExtraId: "",
-                                              rateId: model.rateId,
+                                              estimate: model.estimate,
                                               reversed: model.reversed,
                                             );
 
                                     if (response.value == null) {
                                       if (mounted) {
                                         Navigator.of(context).pop();
-                                      }
 
-                                      unawaited(showDialog<void>(
+                                        unawaited(
+                                          showDialog<void>(
                                             context: context,
                                             barrierDismissible: true,
                                             builder: (_) => StackDialog(
                                               title: "Failed to create trade",
-                                          message:
+                                              message: response.exception
-                                              response.exception?.toString(),
+                                                  ?.toString(),
                                             ),
-                                      ));
+                                          ),
+                                        );
+                                      }
                                       return;
                                     }
 

lib/services/exchange/change_now/change_now_exchange.dart

@@ -31,7 +31,7 @@ class ChangeNowExchange extends Exchange {
     String? extraId,
     required String addressRefund,
     required String refundExtraId,
-    String? rateId,
+    Estimate? estimate,
     required bool reversed,
   }) async {
     late final ExchangeResponse<ExchangeTransaction> response;
@@ -41,7 +41,7 @@ class ChangeNowExchange extends Exchange {
         toTicker: to,
         receivingAddress: addressTo,
         amount: amount,
-        rateId: rateId!,
+        rateId: estimate!.rateId!,
         extraId: extraId ?? "",
         refundAddress: addressRefund,
         refundExtraId: refundExtraId,

lib/services/exchange/exchange.dart

@@ -69,7 +69,7 @@ abstract class Exchange {
     String? extraId,
     required String addressRefund,
     required String refundExtraId,
-    String? rateId,
+    Estimate? estimate,
     required bool reversed,
   });
 }

lib/services/exchange/majestic_bank/majestic_bank_exchange.dart

@@ -44,7 +44,7 @@ class MajesticBankExchange extends Exchange {
     String? extraId,
     required String addressRefund,
     required String refundExtraId,
-    String? rateId,
+    Estimate? estimate,
     required bool reversed,
   }) async {
     ExchangeResponse<MBOrder>? response;

lib/services/exchange/simpleswap/simpleswap_exchange.dart

@@ -30,7 +30,7 @@ class SimpleSwapExchange extends Exchange {
     String? extraId,
     required String addressRefund,
     required String refundExtraId,
-    String? rateId,
+    Estimate? estimate,
     required bool reversed,
   }) async {
     return await SimpleSwapAPI.instance.createNewExchange(