Glue, a hassle-free, all-in-one customer loyalty program, designed specifically for local business owners Glue is a customer loyalty program designed specifically for local business owners. So much more than just a coupon creator or loyalty card maker, Glue offers local businesses their very own branded loyalty app, and an automated loyalty manager that knows just what and when to send your customers to get them coming back. With Glue, your local business can now offer its customers the same rewards, points, and coupons as every major chain, at a fraction of the cost and with zero hassle.