class CommonResponse { int? error; int? balance; String? message; CommonResponse({this.error, this.balance, this.message}); CommonResponse.fromJson(Map json) { error = json['error']; balance = json['balance']; message = json['message']; } Map toJson() { final Map data = new Map(); data['error'] = this.error; data['balance'] = this.balance; data['message'] = this.message; return data; } }