Amazon gift cards.

Im wondering if lets say... I buy a Amazon gift card code(Code, not card) and enter it onto my own amazon account, would they be able to get it back or empty the card balance because they still have the code. Basically can they get the funds back or so?

 

No. Once a giftcard is used, it's drained of any value. When someone buys a gift card, the barcode is entered into their system, and a specific value attached to the unique code. Once that is depleted, or turned into store credit, the code is useless.