[android-developers] Best Practice for selling app in non-Market approved countries?

The title more or less says it all.

Google Checkout, as you may be acutely aware, only supports ~9
countries. Some apps use PayPal to receive payment, then send out an
"activation code" to the user. How can this be done to ensure that a
single user receives a single activation code? Once the app verifies
the code, how could the app more or less "verify itself" that it's
been paid for? Storing such data in a preference file or a database on
the Android device can surely be easily extracted and exploited.

How are other developers handling app sales in other countries--or do
they just not care?

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