The authentication time formatted as a UTC string. This is the time the user authenticated (signed in) and not the time the token was refreshed.
The entire payload claims of the ID token including the standard reserved claims as well as the custom claims.
The ID token expiration time formatted as a UTC string.
The ID token issued at time formatted as a UTC string.
The sign-in provider through which the ID token was obtained (anonymous, custom, phone, password, etc). Note, this does not map to provider IDs.
The Firebase Auth ID token JWT string.