I'm attempting to write some server side code that calls the Rock API to pull some data. The issue I'm running into is that my code gets the contents of the .ROCK cookie passed in, and it needs to pull the Person.ID associated with that cookie value. I've searched the documentation and played around with different calls, but I can't seem to figure out how to get from point A to point B. Is there an API that I'm missing somewhere? What I'd like is an API that takes a .ROCK cookie value, tells me if it's valid or not, and returns me some information on who that cookie value belongs to.