diff --git a/example/lib/blocs/active_symbols/active_symbols_bloc.dart b/example/lib/blocs/active_symbols/active_symbols_bloc.dart
index 0d28ae0db2..3b784534c7 100644
--- a/example/lib/blocs/active_symbols/active_symbols_bloc.dart
+++ b/example/lib/blocs/active_symbols/active_symbols_bloc.dart
@@ -51,6 +51,6 @@ class ActiveSymbolsBloc extends Bloc<ActiveSymbolsEvent, ActiveSymbolsState> {
   Future<ActiveSymbolsResponse> _fetchActiveSymbols() async =>
       ActiveSymbolsResponse.fetchActiveSymbols(const ActiveSymbolsRequest(
         activeSymbols: 'brief',
-        productType: 'basic',
+        productType: 'basic', landingCompany: '',
       ));
 }
diff --git a/example/lib/blocs/available_contracts/available_contracts_bloc.dart b/example/lib/blocs/available_contracts/available_contracts_bloc.dart
index 47e631784a..3a4ef898d0 100644
--- a/example/lib/blocs/available_contracts/available_contracts_bloc.dart
+++ b/example/lib/blocs/available_contracts/available_contracts_bloc.dart
@@ -9,6 +9,7 @@ import 'package:flutter_deriv_api/basic_api/generated/api.dart';
 import '../active_symbols/active_symbols_bloc.dart';
 
 part 'available_contracts_event.dart';
+
 part 'available_contracts_state.dart';
 
 /// AvailableContractsBloc
@@ -75,5 +76,6 @@ class AvailableContractsBloc
   ) async =>
       ContractsForResponse.fetchContractsForSymbol(ContractsForRequest(
         contractsFor: selectedSymbol?.symbol,
+        landingCompany: '',
       ));
 }
diff --git a/lib/api/response/p2p_advert_create_response_result.dart b/lib/api/response/p2p_advert_create_response_result.dart
index cae00b3e42..1467f21aac 100644
--- a/lib/api/response/p2p_advert_create_response_result.dart
+++ b/lib/api/response/p2p_advert_create_response_result.dart
@@ -1,8 +1,8 @@
 // ignore_for_file: prefer_single_quotes, unnecessary_import, unused_import
 
 import 'package:equatable/equatable.dart';
+import 'package:flutter_deriv_api/api/exceptions/base_api_exception.dart';
 
-import 'package:flutter_deriv_api/api/exceptions/p2p_advert_exception.dart';
 import 'package:flutter_deriv_api/api/models/base_exception_model.dart';
 import 'package:flutter_deriv_api/basic_api/generated/p2p_advert_create_receive.dart';
 import 'package:flutter_deriv_api/basic_api/generated/p2p_advert_create_send.dart';
@@ -221,6 +221,7 @@ enum VisibilityStatusItemEnum {
   /// advertiser_temp_ban.
   advertiserTempBan,
 }
+
 /// P2p advert create model class.
 abstract class P2pAdvertCreateModel {
   /// Initializes P2p advert create model class .
@@ -720,6 +721,7 @@ class P2pAdvertCreate extends P2pAdvertCreateModel {
         visibilityStatus: visibilityStatus ?? this.visibilityStatus,
       );
 }
+
 /// Advertiser details model class.
 abstract class AdvertiserDetailsModel {
   /// Initializes Advertiser details model class .
@@ -861,6 +863,7 @@ class AdvertiserDetails extends AdvertiserDetailsModel {
         totalCompletionRate: totalCompletionRate ?? this.totalCompletionRate,
       );
 }
+
 /// Payment method details property model class.
 abstract class PaymentMethodDetailsPropertyModel {
   /// Initializes Payment method details property model class .
@@ -989,6 +992,7 @@ class PaymentMethodDetailsProperty extends PaymentMethodDetailsPropertyModel {
         usedByOrders: usedByOrders ?? this.usedByOrders,
       );
 }
+
 /// Fields property model class.
 abstract class FieldsPropertyModel {
   /// Initializes Fields property model class .
diff --git a/lib/api/response/p2p_advert_list_response_result.dart b/lib/api/response/p2p_advert_list_response_result.dart
index d3dc565671..e5aec1c717 100644
--- a/lib/api/response/p2p_advert_list_response_result.dart
+++ b/lib/api/response/p2p_advert_list_response_result.dart
@@ -1,8 +1,8 @@
 // ignore_for_file: prefer_single_quotes, unnecessary_import, unused_import
 
 import 'package:equatable/equatable.dart';
+import 'package:flutter_deriv_api/api/exceptions/base_api_exception.dart';
 
-import 'package:flutter_deriv_api/api/exceptions/p2p_advert_exception.dart';
 import 'package:flutter_deriv_api/api/models/base_exception_model.dart';
 import 'package:flutter_deriv_api/basic_api/generated/p2p_advert_list_receive.dart';
 import 'package:flutter_deriv_api/basic_api/generated/p2p_advert_list_send.dart';
diff --git a/lib/services/connection/api_manager/base_api.dart b/lib/services/connection/api_manager/base_api.dart
index 8cc480351a..e20df3928a 100644
--- a/lib/services/connection/api_manager/base_api.dart
+++ b/lib/services/connection/api_manager/base_api.dart
@@ -33,7 +33,10 @@ abstract class BaseAPI {
   void addToChannel(Map<String, dynamic> request);
 
   /// Calls a API method by [request].
-  Future<T> call<T>({required Request request});
+  Future<T> call<T>({
+    required Request request,
+    List<String> nullableKeys = const <String>[],
+  });
 
   /// Subscribe to a [request].
   /// [comparePredicate] indicates compare condition for current [request] and [pendingRequest]s
diff --git a/lib/services/connection/api_manager/binary_api.dart b/lib/services/connection/api_manager/binary_api.dart
index 43b58c060c..b3203760f2 100644
--- a/lib/services/connection/api_manager/binary_api.dart
+++ b/lib/services/connection/api_manager/binary_api.dart
@@ -139,9 +139,11 @@ class BinaryAPI extends BaseAPI {
   }
 
   @override
-  Future<T> call<T>({required Request request}) async {
+  Future<T> call<T>(
+      {required Request request, List<String> nullableKeys = const <String>[],}) async {
     final Response response = await (_callManager ??= CallManager(this))(
       request: request,
+      nullableKeys: nullableKeys,
     );
 
     if (response is T) {
diff --git a/lib/services/connection/api_manager/mock_api.dart b/lib/services/connection/api_manager/mock_api.dart
index 15e702553a..a2b0ea308f 100644
--- a/lib/services/connection/api_manager/mock_api.dart
+++ b/lib/services/connection/api_manager/mock_api.dart
@@ -130,7 +130,10 @@ class MockAPI extends BaseAPI {
   void addToChannel(Map<String, dynamic> request) {}
 
   @override
-  Future<T> call<T>({required Request request}) =>
+  Future<T> call<T>({
+    required Request request,
+    List<String> nullableKeys = const <String>[],
+  }) =>
       _getFutureResponse<T>(request);
 
   @override
diff --git a/lib/services/connection/call_manager/base_call_manager.dart b/lib/services/connection/call_manager/base_call_manager.dart
index b813ae87e5..2e5dfb04ea 100644
--- a/lib/services/connection/call_manager/base_call_manager.dart
+++ b/lib/services/connection/call_manager/base_call_manager.dart
@@ -43,7 +43,10 @@ abstract class BaseCallManager<T> {
   bool contains(int? requestId) => _pendingRequests.containsKey(requestId);
 
   /// Calls a API method by [request]
-  T call({required Request request});
+  T call({
+    required Request request,
+    List<String> nullableKeys = const <String>[],
+  });
 
   /// Handle call [response] that comes from server
   void handleResponse({
@@ -62,12 +65,14 @@ abstract class BaseCallManager<T> {
   Future<Response> addToChannel({
     required Request request,
     SubscriptionStream<Response>? subscriptionStream,
+    List<String> nullableKeys = const <String>[],
   }) {
     final Completer<Response> responseCompleter = Completer<Response>();
     final Request requestWithId = request.copyWith(reqId: _getRequestId());
     final Map<String, dynamic> prepareRequest = _prepareRequest(
       request: requestWithId,
       isSubscription: subscriptionStream != null,
+      nullableKeys: nullableKeys,
     );
 
     _addPendingRequest(
@@ -104,9 +109,11 @@ abstract class BaseCallManager<T> {
   Map<String, dynamic> _prepareRequest({
     required Request request,
     required bool isSubscription,
+    List<String> nullableKeys = const <String>[],
   }) {
     final Map<String, dynamic> result = request.toJson()
-      ..removeWhere((String key, dynamic value) => value == null);
+      ..removeWhere((String key, dynamic value) =>
+          value == null && !(nullableKeys.contains(key)));
 
     if (isSubscription) {
       result.putIfAbsent('subscribe', () => 1);
diff --git a/lib/services/connection/call_manager/call_manager.dart b/lib/services/connection/call_manager/call_manager.dart
index 99d1400bf1..d2f72044e1 100644
--- a/lib/services/connection/call_manager/call_manager.dart
+++ b/lib/services/connection/call_manager/call_manager.dart
@@ -29,6 +29,9 @@ class CallManager extends BaseCallManager<Future<Response>> {
   }
 
   @override
-  Future<Response> call({required Request request}) async =>
-      addToChannel(request: request);
+  Future<Response> call({
+    required Request request,
+    List<String> nullableKeys = const <String>[],
+  }) async =>
+      addToChannel(request: request, nullableKeys: nullableKeys);
 }
diff --git a/lib/services/connection/call_manager/subscription_manager.dart b/lib/services/connection/call_manager/subscription_manager.dart
index 913b8f9214..040630ae9d 100644
--- a/lib/services/connection/call_manager/subscription_manager.dart
+++ b/lib/services/connection/call_manager/subscription_manager.dart
@@ -55,6 +55,7 @@ class SubscriptionManager extends BaseCallManager<Stream<Response>> {
     required Request request,
     int cacheSize = 0,
     RequestCompareFunction? comparePredicate,
+    List<String> nullableKeys = const <String>[],
   }) {
     assert(cacheSize >= 0);
 
@@ -78,6 +79,7 @@ class SubscriptionManager extends BaseCallManager<Stream<Response>> {
     addToChannel(
       request: request,
       subscriptionStream: subscriptionStream,
+      nullableKeys: nullableKeys,
     );
 
     return subscriptionStream.stream;
diff --git a/test/api/account/authorize/authorize_test.dart b/test/api/account/authorize/authorize_test.dart
index 4a384c446f..20ef537d00 100644
--- a/test/api/account/authorize/authorize_test.dart
+++ b/test/api/account/authorize/authorize_test.dart
@@ -20,6 +20,7 @@ void main() {
         const AuthorizeRequest(
           authorize: 'sample_token_334da73d',
           addToLoginHistory: true,
+          tokens: [],
         ),
       );
 
diff --git a/test/api/account/new_account_wallet/new_account_wallet_test.dart b/test/api/account/new_account_wallet/new_account_wallet_test.dart
index e3a990eea8..a4fa152a3e 100644
--- a/test/api/account/new_account_wallet/new_account_wallet_test.dart
+++ b/test/api/account/new_account_wallet/new_account_wallet_test.dart
@@ -17,6 +17,11 @@ void main() {
       request: const NewAccountWalletRequest(
         accountType: 'crypto',
         currency: 'BTC',
+        acceptRisk: null,
+        financialAssessment: {},
+        salutation: '',
+        taxIdentificationNumber: '',
+        taxResidence: '',
       ),
     );
 
diff --git a/test/api/common/active_symbols/active_symbols_test.dart b/test/api/common/active_symbols/active_symbols_test.dart
index bfde84029a..fecbca988c 100644
--- a/test/api/common/active_symbols/active_symbols_test.dart
+++ b/test/api/common/active_symbols/active_symbols_test.dart
@@ -16,6 +16,7 @@ void main() {
       const ActiveSymbolsRequest(
         activeSymbols: 'brief',
         productType: 'basic',
+        landingCompany: '',
       ),
     );
 
diff --git a/test/services/call_manager/base_call_manager_test.dart b/test/services/call_manager/base_call_manager_test.dart
index 5ba12de77b..b8c2935823 100644
--- a/test/services/call_manager/base_call_manager_test.dart
+++ b/test/services/call_manager/base_call_manager_test.dart
@@ -50,7 +50,10 @@ class MockCallManager extends BaseCallManager<MockResponse> {
   MockCallManager(BaseAPI api) : super(api);
 
   @override
-  MockResponse call({required Request request}) {
+  MockResponse call({
+    required Request request,
+    List<String> nullableKeys = const <String>[],
+  }) {
     throw UnimplementedError();
   }
 }
@@ -60,7 +63,11 @@ class MockAPI implements BaseAPI {
   void addToChannel(Map<String, dynamic> request) {}
 
   @override
-  Future<T> call<T>({required Request request}) => throw UnimplementedError();
+  Future<T> call<T>({
+    required Request request,
+    List<String> nullableKeys = const <String>[],
+  }) =>
+      throw UnimplementedError();
 
   @override
   Future<void> connect(