re: Gift cards are allowed From personal experience, gift cards are impossible to verify. See, for example, my mediator's terms:
I do not mediate gift card transactions because it is impossible to determine the cause of disputes when a buyer claims a card is empty or the code is invalid. There are three possible scenarios:
an issue with the card itself;
the buyer is a scammer who drained the card's funds and is attempting to scam the seller; or
the seller is a scammer who provided an empty card from the start.
As a mediator, I lack the knowledge or evidence to make an informed decision.
re: Gift cards are allowed
From personal experience, gift cards are impossible to verify. See, for example, my mediator's terms: