Can I use app and itunes gift card to purchase apple product?

If you're in a country where the combined Apple Gift Card is available(currently the USA, Canada, Australia, Japan, Austria, Denmark, Finland, France, Germany, Ireland, Italy, the Netherlands, Norway, Poland, Spain, Sweden, Switzerland, or the UK), and you're using the online Apple Store, yes. Otherwise, no.

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App and iTunes gift cards can only be used to purchase things from the App and iTunes Stores.