FFXIV Tokens provide players with a convenient, secure way to exchange gil for game time directly through the in-game Market.
Visit the Market and use your hard-earned gil to purchase one of the FFXIV Tokens another player has put up for sale. Once the Token arrives in your in-game mailbox, right-click it to add it to your bag, then right-click again and 30 days of game time will be added to your account.
WoW already did it and it's awesome.