With the .NET library, I am using the AuthenticatorFactory ritual to the push and pull methods.
What is the method/property that confirms whether or not the user is
authenticated? Or do I have to do some REST thing to see if the user
really exists or not?
There isn’t. We’d have to send a request to the server to check, which would generally be redundant. Instead, just start the replication. If the user isn’t authenticated the replication will stop with a 401-status error.