I try to add SSO Single Sign On to my forum. Successfully added Twitter, I added the keys for Google and Twitter to the config.php file. My problem is with the REDIRECT URIS from the Google API settings. I tried both http://actforum.nl/index.php?u=/uni_login/authorize&hauth.done=Google and http://actforum.nl/uni_login/authorize&hauth.done=Google but both give error 400. Error: redirect_uri_mismatch I'm using pretty URLs. What should be the Callback URL for Google? Thanks!