Legally, Google has itself covered. Although the terms of service for Google Play say nothing about sharing information with app makers, it’s actually Google Wallet, the company’s Paypal-like online payment platform, that handles the transaction. And just like Paypal, Google Wallet shares buyer information with the merchant, as noted in its privacy policy.
When asked to respond, Google sent over the following statement: “Google Wallet shares the information needed to process transactions, and this is clearly stated in the Google Wallet Privacy Notice.”