You can use the
getGameAuthToken function to retrieve the game authentication token for the current user for use with the server-side authentication API. All guest users have the same authentication token, and do not need to be authenticated by your server.
The authentication token for the user.
You should not assume that the authentication token will remain the same for each user, as it will change any time a user changes their password.
var token:String = kongregate.services.getGameAuthToken();
var token = kongregate.services.getGameAuthToken();