I found an undocumented method IsClientLoggedIn in PlayFabClientAPI.cs. Presumably this is true once the player has signed in using any of the various ways, e.g. facebook.
If I later make a call e.g. GetUserData and my session ticket has expired, will IsClientLoggedIn return false as soon as I've made the call?
The tools team is working to get the docs updated for IsClientLoggedIn shortly. What it's checking is that a Session Ticket exists, which means that a login operation succeeded at some point. However, the only way to know that the Session Ticket has expired is by trying a call to the service, so you do still need to check the return results from calls to PlayFab, to see if the ticket is still valid.
"However, the only way to know that the Session Ticket has expired is by trying a call to the service, so you do still need to check the return results from calls to PlayFab, to see if the ticket is still valid."
I understand this, but if after the call the ticket is not valid, will IsClientLoggedIn then return false?
No, the _authKey is updated when you call any login function. When any Client API call returns an error indicating that the Session Ticket is no longer valid, you should always proceed to logging the user in again. If you want to set the _authKey to null whenever a 401 is returned, you could create a base ErrorDetails function which does this on any 401 or invalid ticket error return, though.
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