WordPress Membership Plugin
Sorry for not being clear enough.
Yes i am building adesktop client for Windows using C#, WPF and the .Net FrameWork enviroment.
I am using the official the SWPM API plugin to enable the API
(https://simple-membership-plugin.com/simple-membership-api-querying-member-account-using-http-post-request/)
I am making a simple POST request from my desktop application in C# to get a users information, the POST request includes the API key in Hard coded text.