Check Apple Gift Card balance
Check tge balance on apple hift card
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Check your gift card balance - Apple Support
You’d be well-served to redeem any gift card onto your Apple Account soonest for secure safekeeping.
An unredeemed gift card is vulnerable to loss or code compromise; and ALL value would be lost to you.
How to redeem your Apple Gift Card, App Store Card, or App Store & iTunes Gift Card - Apple Support