Google Apps API

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https://developers.google.com/oauthplayground/

OAuth 2.0 Playground

The access token below is provided after going through Step 1. It is a short lived token which gives you access to the user's OAuth protected resources.
Google Apps with SSO

Apps - Google Code

https://developers.google.com/google-apps/email-migration/ The Google Apps Email Migration API allows administrators and users of Google Apps to migrate mail from legacy email systems into their domain's hosted Gmail accounts.
Security Assertion Markup Language (SAML) is an XML standard that allows secure web domains to exchange user authentication and authorization data. https://developers.google.com/google-apps/sso/saml_reference_implementation

Apps - Google Code