Can I apply my FLX Cash reward to an earlier purchase? No, you cannot. FLX Cash does not apply to prior orders and can only be used at checkout. Related articles The item I want is marked “excluded from discount.” Can I use FLX Cash to pay for it? I forgot to tell a store team member I’m an FLX Rewards member. Can I still get points for my purchase? Contact Us Can I get points for purchases I made before I joined FLX Rewards? Can I change or cancel an order?