AppStore. Validate the purchase of the app.

Hi Experts,

I have a paid app published in Apple AppStore.
I want to encourage the buyers of the app by giving them some extra bunus.
Here I mean the purchasing the app itself, not In-App Purchases.

How can I verify that the client really bought the app?
I can ask the client to forward me an 'Order Number' of his purchase (receipt), but how can I verify this order number?

Is there any other ways to track the fact of purchasing the app?

Thanks.
MrCookJr2011Asked:
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pgnatyukConnect With a Mentor Commented:
I hope this article will help you:
HOW TO THWART IPHONE IPA CRACKERS:Detection
It proposes a way to detect if the app was stolen and so maybe you can implement something like that in your app.
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MrCookJr2011Author Commented:
Not exactly we need, but thank you, it can help us in our development
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