Backend server for Android clients - Possible to verify that the customer has bought the application?
<p>Scenario: Server providing a rest-api to Android clients. There are no subscriptions involved, but customers have to pay for the application in order to get access to the rest-service. </p>

<p>Does Google offer an API the back-end server can use to query Google whether the given client has paid for the application? Perhaps by forwarding an installation / purchase id from the client? </p>
