Do not use deprecated transactionReceipt property. Test to see if new property, appStoreReceiptURL, is available. Only available in iOS 7.0 and above. Original check was incorrect and used iOS 6.1.
Do not use deprecated transactionReceipt property. Test to see if new property, appStoreReceiptURL, is available. Only available in iOS 7.0 and above. Original check was incorrect and used iOS 6.1.

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