How do I redeem my Apple Gift card with some codes scratched off?

Click here and ask Apple Support for assistance; supply them with the remaining characters.

The people on these boards are mostly other customers and won't know what the missing ones are.

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In addition, never post your gift card on a public site such as this one. After you contact Apple directly, you will be given the opportunity to provide them with a picture of the card. Someone could correctly guess the characters and you would not have any money left on the card.