Implementing OpenID

Posted by openid on Stack Overflow See other posts from Stack Overflow or by openid
Published on 2010-04-28T05:39:08Z Indexed on 2010/04/28 5:43 UTC
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Following this tuto:

http://www.plaxo.com/api/openid_recipe

One of the steps is:

Need to look up whether the OpenID entered already belongs to an existing user on your site

My problem:

what's the OpenID like for a gmail account(I've no other OP account yet)? It seems to me that OpenID = https://www.google.com/accounts/o8/id for gmail, but how can I use that to look up since it's the same for all users?

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