How to look up your App Store purchase history
AppleInsider -

Being able to look up your past purchases on Apple's App Store can help you recover an app you accidentally deleted, or spot a problem with a subscription. Viewing your purchase history on an iPhone The list of all purchases across all your devices appears, along with what you paid for them -- including any free apps. If you go back a long way with the App Store, you may have to scroll down quite a lot to see the entire list. This will also include any music purchased from Apple...

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