can't purchase in any game app, but I can purchase in itu
can't purchase in any game app, but I can purchase in iTunes
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See the following Apple articles:
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)
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