How do I check my Apple Gift Card balance?
Trying to check balance here don't go thur
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Follow the steps here to redeem the Gift Card and it will show the value that was redeemed. Once redeemed there is nothing left on the card and you cannot redeem just part of it.
How to redeem your Apple Gift Card, App Store Card, or App Store & iTunes Gift Card - Apple Support
If you cannot redeem the Gift Card, the review the information here depending on what happens when you try.