I'm developing an android application and I would like some functionality of the application is not free.

I have thought to use in-app Billing Version 3 API, so I have defined an "In-App Product" in the developer console.

After reading the documentation, I know that when I start the purchase flow I should pass in a string token that helps the application to uniquely identify the user who made the purchase.

But how could I obtain a string token that identify the user?

Thanks

android in-app-purchase in-app-billing billing android-billing
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