If you head to http://www.zoho.com and look at the login panel on your right, you can see they are accepting google sign-in as a login alternative for their visitors. My question's how am I gonna do that for one of my sites? I have searched on google but it always turns out webmaster tools results rather than the thing I'm looking for. I guess it will need an API so where can I acquire it? Thanks!
You need to decode the following https://www.google.com/accounts/ServiceLogin?service=lso&domain=zoho.com&continue=https%3A%2F%2Fwww.google.com%2Faccounts%2Fo8%2Fud%3Ffrom_login%3Dyes%26openid.ns.ext1%3Dhttp%253A%252F%252Fopenid.net%252Fsrv%252Fax%252F1.0%26openid.claimed_id%3Dhttp%253A%252F%252Fspecs.openid.net%252Fauth%252F2.0%252Fidentifier_select%26openid.ext1.required%3Demail%26openid.assoc_handle%3DAOQobUfDfs2aUKpIy7TaeKnr7MjHFxkfeOAUETgei9MQJ0I5kFTe6BdS8HPG8TwCYX9wt2AH%26openid.ns%3Dhttp%253A%252F%252Fspecs.openid.net%252Fauth%252F2.0%26openid.identity%3Dhttp%253A%252F%252Fspecs.openid.net%252Fauth%252F2.0%252Fidentifier_select%26openid.ext1.type.email%3Dhttp%253A%252F%252Faxschema.org%252Fcontact%252Femail%26openid.mode%3Dcheckid_setup%26openid.ext1.mode%3Dfetch_request%26openid.realm%3Dhttps%253A%252F%252F*.zoho.com%26openid.return_to%3Dhttps%253A%252F%252Faccounts.zoho.com%252Fopenid Code (markup):