class ServiceSettingDto { final String key; final String value; final String description; const ServiceSettingDto({ required this.key, required this.value, this.description = '', }); factory ServiceSettingDto.fromJson(Map json) { return ServiceSettingDto( key: json['key']?.toString() ?? '', value: json['value']?.toString() ?? '', description: json['description']?.toString() ?? '', ); } Map toJson() { return { 'key': key, 'value': value, 'description': description, }; } }