Hi Koirala,

You can use the Federated Login/OpenID API for user authentication:
http://code.google.com/apis/accounts/docs/OpenID.html

Work is being done to combine authentication (OpenID) and
authorization (OAuth)
into a single step (the user signs into a Google page AND returns to
your
site with an OAuth token).
http://step2.googlecode.com/svn/spec/openid_oauth_extension/drafts/0/openid_oauth_extension.html

Eric

On Dec 30 2008, 5:26 pm, Koirala <[email protected]> wrote:
> Hello,
>
> Google explicitly specifies that "The third-party service must support
> user accounts" on step 4 
> athttp://code.google.com/apis/health/third_party_overview.html.
>
> Would not it be nice if the users just had to login at the google page
> instead of both at google page and the third party service page ?
> Because I would have the session token after the user hits links
> profile, can't I use the session token to identify the user and log
> him/her in automatically into my service page?
>
> I would be grateful to your help.
>
> -Koirala
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