Since Enterprise Server for .NET CICS REST web services use standard protocols, they can be invoked by clients using various framework and third-party APIs, with no Micro Focus libraries or licenses required on the client system (unless the client program is COBOL).
There are also third-party libraries for native-code applications. Microsoft Windows includes the WinINet and WinHTTP APIs. The open-source cURL library has been used with native-code COBOL programs to communicate with REST web services.