Reputable refer earn apps usually function by giving users a special code or link that they can share with others. The original user earns ataken take download apk reward—cash, gift cards, or other incentives—when someone uses that link or code to sign up for the app or service. A win-win scenario for both parties is created by certain refer earn apps, which Also provide extra incentives for the new user. Openness and Monitoring Referrals.