1. You can have someone else on your Acc on FK redeem it on another Amazon account before you do
2. You could have a Friend come over and tell them to quickly copy-paste.
Either way, there is NO way to confirm The validity of the code, but many ways to show that you didn't send money. Just don't Deal with anyone fishy Homie, I'd hate to see a honest gentleman get banned. Those two are just senario so came up with on the spot while reading. Nonetheless good luck with sales