Gift card balance
How to fine the balance on my gift card
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The balance on an iTunes or App Store gift card itself is either what it says on the face of the card, or nothing because it has already been redeemed. The only way to check is to try redeeming the card which of course will transfer the entire value, if any, to your account.
Redeem your App Store & iTunes Gift Card - https://support.apple.com/HT201209
View your Apple ID [not the balance on a gift card itself] balance - https://support.apple.com/HT202359
You can go to the following link to check the balance on your Apple Store (but not iTunes Store) gift card. - https://secure1.store.apple.com/shop/giftcard/balance