How can I verify an iOS app buyer

Question

I want to offer a hardware freebie to buyers of my iOS app. This means I need them to provide their shipping address etc.

How can I verify that the person requesting the freebie is an actual buyer?

It seems to me that I can make the offer through the app but how do I know if the user isn't providing multiple names and addresses?

I could disable the offer once it is used but it would be restored if the user deletes the app and reinstalls it.

Any ideas or recommendations? Much appreciated.

Answer 1

在您的SKPaymentTransaction响应中，如果用户购买了（transactionState为Purchased ），则可以将其UUID发送到服务器，CloudKit或您自己的服务器，并且当他们从设备发送硬件请求时，您可以包含UUID，并进行检查云存储的值，并且仅在以下情况下才向他们发送硬件：（a）他们购买了（b）您还没有发送给他们。