Douglas Boberg

iOS developers: Verify your Apple payment transactions are valid.

This receipt verification service is for iOS in-app purchases (IAP). If you offer IAP then you should add receipt validation code to your App to prevent unauthorized purchases from being accepted. Performing this validation from the device directly to Apple is not secure. It is not possible to build a trusted connection between an arbitrary user's device and the App Store because you don't control either end of that connection.