Define any additional scopes to be requested, separated by a comma (e.g.: https://www.googleapis.com/auth/youtube.upload,https://www.googleapis.com/auth/youtube.readonly).<br>
                                  The scopes  'openid' 'email' and 'profile' are added by default and always requested.<br>
                                  You can see the full list of valid scopes and their description <a href="@scopes">here</a>.