This way, even if you happen to lose your gift card, or forget the code on it, you can always come back to the portal and look it up. They will available either in your wallet if you chose to link one, or whatever website you had chosen to carry out the transaction on. The code that appears on the card and on the receipt must match you must send a picture. Now for you to start the trade, you need to conduct a search on the website you have chosen for sellers that actually accept gift cards.