Does fiverr not allow the selling and buying of gift cards? Such as Google play, PlayStation, xbox, itunes, etc.?
Not that I know of, no.
You don’t have the right or authority to sell “gift cards” for another company. And, since Fiverr is a services platform, gift cards don’t seem to be something appropriate to this marketplace.
Due to many Call center scammers that steal from elders with fake viruses and similar scams or refund “mistakes”, and the Microsoft can not accept extra money to be returned to their bank account but only in Google play cards, no.
It is not allowed.
At Fiverr you sell a service to your clients, I think you’re looking for Ebay.