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This is still OpenID.

Google uses a singular URL for all identities that OpenID consumers use to discover the true user identity, which is unique per user per consumer domain.

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If it only accepts google logins, then it doesn't matter if google is using openid as the mechanism -- you can't say you use openid logins. It's like if I said that my application supports CSV, but you have to provide it as an Excel file.

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