OptionalauthAdditional authorization parameters merged into the authentication request.
OptionalonCallback invoked if an unexpected error occurs during the sign-in flow.
OptionalregisterWhen true, initiates the user registration (sign-up) flow instead of a standard sign-in.
OptionalreturnRelative URL to redirect the user to after successful authentication.
If not provided, the application base URL (appUrl) is used.
Options used to customize the sign-in flow.