How do I get a permanent long term authentication token for google apps application?

Hi guys I'm working on my google apps application - currently I've build the authentication upon the example available at google namely this url

The problem is that the session seems to time out and that everytime I am logged into my goog开发者_如何转开发le apps account and go to my application I need to authenticate again and go through the screen where google asks me if I should allow the application to access the services like GMAIL, Docs etc listed in the manifest xml file. I don't think I'm doing it right as other applications allow instant access.

Any ideas

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you should store and reuse the oauth access & secret key. this should avoid the re-authentication with google (or other oauth based services) - unless your access key has been revoked of course.

Cheers!