Strange issue with In App-purchase system IOS, sandbox and live App Store environments -

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i have developed in app-purchase system ios app. have tested in apple sandbox-environment , works great. far have made simple solution saving receipt locally in app after being purchased.

but once live @ app store strange bug occurred. if user purchased app , shuts down (the app) , restarts again receipt gets lost, reason?. since not able recreate bug in sandbox-environment can not debug code , not know start.

i find scenario odd , confusing, if ever experienced similar or have built many in-app purchase systems within ios, please share knowledge or ideas.


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