How Do Online Casino Wagering Requirements Work? They make casino offers rewarding for both the player and the casino operator. So how do wagering requirements work? They are the method that allows online casinos to offer free money to players without the players simply collecting the free money and leaving. But keep reading! We’ll show you that they aren’t as complicated as they seem, so you can complete them efficiently and claim your bonuses. Playthrough requirements, otherwise known as wagering requirements, can seem a bit intimidating.