How do I redeem my Apple gift card if the code is scratched off?

Please follow the steps in this Apple Support article. 

If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support

If after reviewing the article, and following the directions in the article, you need additional assistance please follow the link below to contact official Apple Support. 

Contact Apple Gift Card Support

If you receive a request for payment using Apple Gift Cards, or If you believe you are the victim of a scam, please contact Apple Support and report it to local law enforcement.

You may also report the scam to the FTC Complaint Assistant.

This link will take you to the section of the support article about what to do if your code is unreadable If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support