Uber Eats: Referral programs allow users to receive discounts on their orders for bringing friends who make their first purchase through the food delivery app Uber Eats. 4. Cash Apppirate-themed slots: Cash App is a peer-to-peer payment app. It has a referral program where users can get paid to refer friends who download and use the app to send money. 5. . Airbnb: Users who refer friends who book a stay or host their first guest can receive travel credits from Airbnb. These are only a few illustrations of refer & earn applications from various categories.