in app purchase - How to recognize a user uniquely on android when implementing server-side provisioning of a in-app billing product? -

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i implementing provisioning consumable in-app billing product. product 1000 coins 50p. once consume 1000 coins , want provision them user , track usage. decided store "usage-count" each user in record on server. don't want make user login app. there standard way of recognizing user/app instance uniquely purpose ? popular way of doing ?

there 2 ways distinguish unique users

first identify user account user-name , password.
, if app don't have login module , can still identify installation of app on device bases saving unique device id on server.

refer following link identify unique installation of app per device. http://android-developers.blogspot.in/2011/03/identifying-app-installations.html


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