ok i am planning on using the OpenID and i've read googles documentation and see other tutorials on how to do it. They all use this link https://www.google.com/accounts/o8/ud but that link throws a 400 error. This is no longer in use?
edit: https://www.google.com/accounts/o8/id
edit I ended up going with OAuth 2.0
since im using codeigniter for this project i ended up going with http://hybridauth.sourceforge.net/