still even just a randomization of the 20-25 character length whichever it is cant really remember atm wouldnt work just in itself there is probably some equation to how they get their codes which to figure out you would have to compare multiple codes to figure out and me personally I only played WoW for 5 months so I only have 2 of the 60 day card codes not really enough to go on plus doing such as randomizing those codes would be a federal offense which I dont wanna get into lol