Google Plus Authentication

The 'Google Plus Authentication' script allows webmasters to authenticate site users via their Google+ username and password.

Besides login and logout operations, the script can also pull in profile details once the user has been authenticated.

These can be used later in creating new accounts for the logged in user.

For authentication procedures, the script uses the OAuth 2.0 protocol.

The type of information the script retrieves includes ID number, email address, first name, last name, full name, Google+ profile URL, avatar URL, gender, birthday, and account language settings.