android - Paid App Authenticating Server -

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i have built free app , paid app. when user upgrades or buys paid app, on first launch, want app send "unique id" server every time app launches, check server , authenticate prove user paid app.

what wondering should use "unique id." aware there android.telephony.telephonymanager.getdeviceid() imei or meid , use check validity. however, if use method, when user change cellphone, no longer work. there way user's google id connected android market or sort of unique id related android market when user changes phone, long id login market same, app can authenticate?

please @ android licesing , verification libraray (lvl)

http://developer.android.com/guide/publishing/licensing.html


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