I have just found the following:

http://wiki.opensocial.org/index.php?title=Introduction_To_Signed_Requests
http://wiki.opensocial.org/index.php?title=Validating_Signed_Requests
https://opensocialresources.appspot.com/certificates/

I'll try it if it works with Ning.

On Jan 13, 3:45 pm, Pion <onlee2...@gmail.com> wrote:
> I am wondering if anyone has experience integrating Ning App (http://
> developer.ning.com/) with GAE for Java. Note that Ning only supports a
> subset of OpenSocial API. Specifically, I need help on the following:
>
> 1. Let a user login to Ning network.
> 2. Once Ning has authenticated the user, I'd like to let the user to
> access my app on GAE without having to login twice.
> 3. The user could store additional data on GAE.
>
> I don't know how to do the step #2 above.
>
> I am open with other scenario as long as I can achieve #1 and #3
> (using Ning's username & authentication) to access the data on the
> GAE.
>
> Thanks in advance for your help.
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