Get user info using OAuth2 (https://github.com/intridea/oauth2)

get_google_user_info_oauth2.rb

client = OAuth2::Client.new Figaro.env.omniauth_google_oauth2_app_id,
         Figaro.env.omniauth_google_oauth2_app_secret,
         { site: 'https://accounts.google.com', authorize_url: '/o/oauth2/auth', token_url: '/o/oauth2/token' }
token = client.auth_code.get_token '4/authcode', {}
json = JSON.parse token.get('https://www.googleapis.com/plus/v1/people/me/openIdConnect').body
id = json['sub']
first_name = json['given_name']
last_name = json['family_name']
email = json['email']
email_verified = json['email_verified']