Create SSO Users, Adding To Group, Subscribing to Category via API

Thanks @Falco. I mentioned creating staged users because of what I read in this thread. Perhaps I misunderstand what the aforementioned thread was saying.

Did you also make calls with .Net? If so, do you know of any .Net API wrappers or know where I might find an example of calling the API with .Net to create a user using the API key?

Thanks again.