It is an optional input. Our API can provide response in Arabic or English with Arabic being the default language.It’s an optional input. We currently support output for API’s in two formats Json and XML. You will be required to specify in which format you need response, default is Json.By default response is in windows-1256. Pass "utf8" as input parameter to get utf-8 charset.languageformatRegion IDlanguageformatCity IDlanguageformatlanguageformatID of service category by which its recognized in system. You can obtain service category id by using Service Category API.