How to find the device token for an iPhone app?

I'm in the process of developing an iPhone app that uses push notifications through a database and Urban Airship.
Urban Airship wants to know the device token (a 64 character code).
Anyone got any idea where to find this?
We're working in action script/Flash Builder.
Any help would be hugely appreciated!

Yes, but it is still must be used with APN. Token from APN may be changed, you can't rely on it to identify your device for provider.

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