@wakabayashiThe native module has a validity period setting, see below. The idea is that the coins a customer gets give a discount on their next order, if placed within the validity period. So in my case below, if the customer orders again within 180 days, they get a 5%-of-the-previous-order discount on the new order. If they don't, the points expire and there's no discount. I came across this in another store and found it a quite strong motivator to order again.