How to implement api on websocket and subscribe to events from the server?

Question

API

Hello! Please tell me where to start studying these technologies, I googled a lot, but I could not put together a clear picture in my head. For example: there is api Mango office , I want to write an application in c #, like a softphone, but I can’t figure out how to implement it specifically, which libraries to use. In theory, I realized that I need something like a proxy server that will receive and send all events to the manga itself and a client that will be a softphone. Help put together a clear picture in your head, tell me some articles about these technologies, books or manuals on how to create from scratch using an example, preferably in c#.

Answer 1

Google word webhooks