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Integrate with Google AppEngine
You should set TElSAMLIdentityProvider.DefaultNameIDPolicyFormat to 'urn:oasis:names:tc:SAML:2.0:nameid-format:email' value. Then you should add Google SP to known SPs list in the next way:
C#:
TElSAMLServiceProviderInfo sp = TElSAMLServiceProviderInfo.CreateForGoogleAppEngine("yourdomain.com");
idpServer.AddServiceProvider(SP);