WIP adding landing company

Author: ramin-deriv

lib/services/connection/api_manager/binary_api.dart

@@ -12,6 +12,7 @@ import 'package:flutter_deriv_api/api/manually/tick.dart';
 import 'package:flutter_deriv_api/api/models/base_exception_model.dart';
 import 'package:flutter_deriv_api/api/response/active_symbols_response_result.dart';
 import 'package:flutter_deriv_api/api/response/authorize_response_result.dart';
+import 'package:flutter_deriv_api/api/response/landing_company_response_result.dart';
 import 'package:flutter_deriv_api/api/response/ticks_response_result.dart';
 import 'package:flutter_deriv_api/basic_api/generated/active_symbols_receive.dart';
 import 'package:flutter_deriv_api/basic_api/generated/active_symbols_send.dart';

lib/services/connection/api_manager/isolate_task.dart

@@ -157,11 +157,27 @@ void _handleCustomEvent(
 
       sendPort.send(message.copyWith(data: response));
     case CustomEvent.landingCompany:
+      await _fetchLandingCompnay(api, message, sendPort);
     case CustomEvent.statesList:
     case CustomEvent.residenceList:
   }
 }
 
+Future<void> _fetchLandingCompnay(BinaryAPI api,
+    CustomIsolateEvent<dynamic> message, SendPort sendPort) async {
+  final LandingCompanyReceive response =
+      await api.call(request: message.request);
+
+  checkException(
+    response: response,
+    exceptionCreator: ({BaseExceptionModel? baseExceptionModel}) =>
+        BaseAPIException(baseExceptionModel: baseExceptionModel),
+  );
+
+  sendPort.send(message.copyWith(
+      data: LandingCompanyResponse.fromJson(response.landingCompany)));
+}
+
 Future<void> _fetchActiveSymbols(
   BinaryAPI api,
   CustomIsolateEvent<dynamic> message,