I would like to allow my Google Apps users to automatically register to redmine. I found another post that gave me the site url that I can use.
google.com/accounts/o8/site-xrds?hd=examplefoobar.com
Is there a way I can configure redmine to auto register only openid users (google apps) from my domain, examplefoobar.com ?
Maybe I did not catch exactly your goal. But you can look at our redmine plugin redmine_omniauth_google. It allows to login through google and has a way to setup only your domains.