openIdToken
String openIdToken
Id_token is part of OpenID Connect specification. It can hold user information that you can directly extract
without additional request to provider.
See http://openid.net/specs/openid-connect-core-1_0.html#id_token-tokenExample and
https://bitbucket.org/nimbusds/nimbus-jose-jwt/wiki/Home
Here will be encoded and signed id token in JWT format or null, if not defined.