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To avoid the case in the future, see:
Require a password for App Store and iTunes purchases
Require a password for App Store and iTunes purchases - Apple Support
Manage App Store purchases, subscriptions, settings, and restrictions on iPhone
Manage App Store purchases, subscriptions, settings, and restrictions on iPhone – Apple Support (UK)
Prevent in-app purchases from the App Store
Prevent in-app purchases from the App Store – Apple Support (UK)