Positive reinforcement like this promotes referrals and continuous app usage. Financial services, food delivery, and e-commerce are just a few of the industries thlondon satta kingat use refer & earn programs. By using natural, word-of-mouth marketing techniques, they are a useful tool for attracting and keeping customers. You must first register as a user in order to use a refer and earn app. Usually, this entails going to the website and making an account or downloading the app from the app store.