Hi! i want to create a timelog App so employees can quickly check on-the-fly tasks and enter the amount of time they've spent on. my goal is that the user can log-in in my app to see their tasks. is there a way to authenticate a user ? i understand the getUser() methods but i don't see in the documentation any functions to validate a user name&password. i would need a kind of validateUser(user, pass) method. Thanks !