After the token has been validated, a request may be made of the UserInfo endpoint. This endpoint is located at https://www.googleapis.com/oauth2/v1/userinfo.

The request must include the access token. The access token may be sent in the query string or in the Authorization header.

The Google endpoint responds with a JSON object that contains the following fields:

Name Value
id  (the id of the user)
email (if scope requested)  (the email of the user)
verified_email  (whether the email has been verified)
name  (the identifier of the user)
given_name  (the first name of the user)
family_name  (the last name of the user)
link  (a link to the user's profile)
picture  (a picture of the user)
gender  (the gender of the user)

This list will likely change over time