Can't redeem Apple gift card

See if this might help:

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

So give your friend their card back and THEY can request their refund from their place of purchase.

If you bought and activated it from Walmart but it doesn't work …

… like any other piece of defective merchandise …

… return it to Walmart.

I bought a Apple Card from Walmart today and the card code is incomplete

So what should I do now

a friend sent me a Apple Card and I’m trying to redeem it but it saying used card