Abstract: A referral-based loyalty program incentivizes referrals by awarding rewards to primary customers for transactions by secondary customers. The secondary customers receive primary-account-identifying information, such as by hyperlink, and navigate to an order page of a merchant to establish an account and implement a transaction, for which the primary customer receives an reward. Primary and secondary accounts can be linked with one another at the merchant premises, or online, and can be associated with physical cards carried by the customers and presented during transactions. Rewards can be made contingent upon registration and activation of accounts.