The URI you want the user to be redirected after checking authentication. Only used when
= REDIRECT. Not required, default is the current URI
When passed, the initial login screen where a user can choose between social logins and regular signings is skipped and goes directly to the given identity provider
register (this immediatly triggers the registration flow for new users)
password , an
emailHint can be provided. This will prefill the email address in the login screen.