Referral programs are a common feature on money-making apps, encouraging users to encourage their friends & family to sign up for the service. When a new user registers using a special referral link, referral prummy game online cashrograms usually give bonuses or other incentives to both the referrer & the new user. You can increase your app earnings by making use of referral programs. For every person who signs up and begins making money on the app through your referral link, you will receive extra rewards. If you follow or have a large social media following of friends who might be interested in using the app, this can be extremely helpful.