The only thing I can say is "beware of scammers." I don't want the buyer to say the code/pin doesn't work (and it would normally work for the buyer) especially when I've typed everything correctly.
ok, but how would that solve the problem of the person on the other end lying and saying it didnt work? Anyone could still do that after receiving it in an envelope. Whatever...you have your preference, doesnt matter to me. Good luck.