Many stores today offer some type of reward or loyalty cards. By way of example;
1. _____ offers customers the use of a card which gives the customer a discount on selected products. This is only for those making use of the card otherwise there is no discount.
2. _____ offers customers the use of their points cards. The card being used offers discounts and a system of points when accumulated also translates into a cash discount.
My question:
Is it permissible to use these loyalty/reward cards?