GOT QUESTIONS ABOUT OUR COFFEE APP? WE’VE GOT ANSWERS. HOW DOES THIS WHOLE COFFEE APP THING WORK? Download the free Dunn Brothers Coffee Rewards App from iTunes or Google Play to your iPhone or Android phone. Link your credit or debit card to get your code. The next time you’re in a Dunn Brothers Coffee shop, scan your phone at the checkout to pay. You’ll get instant digital receipts after each purchase.