We're using in-app purchases in our app and validating receipts on server side.
As a result of validation we get Receipt object described here. We store the transaction_id in our records as a unique identifier of the purchase.
Then, some time after the purchase a user who made a purchase in our app looks at Purchase History in the iTunes app and see this identifiers:
Question: How can we match this identifiers with the validated receipt?
For example, it's useful in the case when users contact us via support channels and want to restore their accounts.
