ios7 - In iOS 7, how to extract the values of Receipt Fields from the In-App Purchase receipts? -
    i know in ios 7, app's receipt , in-app purchase receipts combined encrypted format structure shown here , automatically written storage.   i know receipt(s) have fields, documented here .   i know how retrieve receipt combo calling appstorereceipturl .   i know how validate receipt passing apple servers either directly or via own server.   but how parse receipt extract fields?    i need kind of identifier each of possible in-app purchases record user's ownership in way can verify repeatedly later.          if send receipt apple validation, json structure receipt fields. asking how parse json structure?