I’ve been searching and trying to find information on how to handle this in C# as well. Unfortunately all I could find so far have been “tutorials” for the WebHooks Visual Studio handles natively, which essentially does everything for you without telling you how it does it. The closest thing I could find that might be useful is this msdn tutorial to create your own rest api to handle the POST that Twitch sends to your call back URL. I have no idea if this is the right path to go down, so this very well may be a rabbit hole that may be all for nothing. It’s an interesting read at the very least.