Redeeming an Apple Store Gift Code in the App Store
I received an Apple Store Gift Code as a gift by mistake.
Can I use it in the App store instead?
No, you need an iTunes gift card for the App Store.
Late 2012 Mac mini, macOS 10.13.1; Watch S3, watchOS 4.1; iPad Air 2 & iPhone 6+, iOS 11.2; TV 4th Gen, tvOS 11.1; Airport Express, AirPods