I remember some sites that provided such services but unfortunately, many of them stopped this year.
There are still some vendors at Bitify.com's site who offer such services "You can find them by searching through the site". In addition to the escrow provided by the site and the new update of the rules of selling cards, I think you will be safe.
"You can’t access the transaction history but the seller can provide you the verification code."
Good luck.
BTW: move this post into
Digital goods