The Referral System would allow current users to invite their friends and family to download and use the Klever Wallet. Each user would have a unique referral link/code that they can share with others.

Whenever a new user registers an account using a referral link/code, both the referrer and the new user would receive a reward.

The Gamification Engine would complement the Referral System by adding a competitive and fun element to it. Users could be incentivized to earn badges, points, or cryptocurrency rewards based on their referral activity. For example, the system could provide badges for "first successful referral," "5 successful referrals," and so on. Leaderboards could be implemented as well, highlighting the users with the most successful referrals each week or month.