One such success story is Sarah, who during her college years earned extra cash by using the refer and earn program of a well-known ride-sharing app. On cvegas slots online freeampus and on social media, Sarah gave her referral code to other students. She worked hard and was able to earn enough in referral bonuses to pay for her transportation costs each month. Michael is a successful user of a food delivery app who earned credits for free meals by referring others to the program.