We are facing an issue where some users send receipts with an empty 'in_app' attribute during server validation. We are using the API described here: https://developer.apple.com/documentation/appstorereceipts/verifyreceipt After a purchase, we validate the receipt on the server and call finishTransaction in the app. Most receipts are fine, but this issue affects some users. The documentation states that an empty 'in_app' attribute means no valid purchases: https://developer.apple.com/documentation/appstorereceipts/responsebody/receipt/in_app#discussion Our questions are: When is a receipt with an empty 'in_app' attribute generated? How should we handle such receipts? Thank you for your help. Best regards,