A friendly competitive spirit is fostered in users by the inclusion of leaderboards or recognition systems in many apps, which further encourage users to actively participate in the refepci express slotsrral program. Refer and Earn applications provide lots of chances to get rewards, but users have to be careful not to fall into common traps that can make things harder for them. Ignoring the fine print attached to referral programs is one common error. Every app has its own policies about who can be referred and minimum purchase amounts in order to qualify for rewards.