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 I forgot to tell a store team member I’m an FLX Rewards member. Can I still get points for my purchase? If I return my item, will I get my FLX Cash back? The item I want is marked “excluded from discount.” Can I use FLX Cash to pay for it? Can I earn points on my order when I use FLX Cash? How do I manage my FLX Rewards account?