In World of Quests, you will sometimes receive money as a reward for completing quests.
Just like your characters and your items, the money used in the game is stored in your wallet (~guild's vault). You can do whatever you want with it outside the game.
The token used as currency is WOQG(World of Quests Gold).
In game equivalence
In the world, people prefer to talk in number of pieces. Pieces are made from different metals.