1. You must start off with 3 digits of an amazon giftcard you can ask a second hand seller (Ebay) to send you 3 digits so you can "prove the card is real"

2. Email amazon support saying something along the lines of "I purchased a $50 giftcard and when i was scratching of the cover on the code most of my code got scratched off"

3. Amazon support will email you back asking for 3 consecutive digits from the card because amazon uses a algorithm to check giftcards that will show a giftcard does not work

4. Amazon should then add the balance from the card to your amazon account