The $3 rebate "tip" doesn't work in the app. I notified Domino's customer service about this last week, and got no response. They owe me $12 since the promo started, not including the "piece of the pie rewards" that never accumulate. I ordered Domino's pizza almost exclusively for years, but now I'll give my business elsewhere. If you're going to offer deals, actually let your customers use them. Also, the app is less user-friendly than the website, and sends too many notifications.