I have recently developed a In App-purchase system to my IOS app. I have tested it in the apple sandbox-environment and everything works great. So far I have made a simple solution with saving the receipt locally in the app after it being purchased.
But once live at the App Store a strange bug occurred. If a user purchased the app and then shuts it down (the app) and then restarts it again the receipt gets lost, for some reason?. Since I am not able to recreate the bug in the sandbox-environment I can not debug the code and I do not know where to start.
I find the scenario very odd and confusing, if someone ever experienced something similar or have built many In-App purchase systems within IOS, please share your knowledge or ideas.