Set your scopes to:
And use the endpoint:
https://www.googleapis.com/oauth2/v1/userinfo?alt=json
Usage:
get https://www.googleapis.com/oauth2/v1/userinfo?alt=json&access_token=youraccess_token
You will get JSON:
{ "id": "xx",
"name": "xx",
"given_name": "xx",
"family_name": "xx",
"link": "xx",
"picture": "xx",
"gender": "xx",
"locale": "xx"
}