Every eligible member of Firecracker has a unique referral link that (s)he can share with friends and colleagues. When a new student clicks this unique referral link it sets a cookie on that student’s computer so that if that student purchases Firecracker anytime in the next day, the referrer gets credit. The tracking cookie expires after 24 hours.
Note that if a new user has more than one referral link, the first link clicked will get credit for any sale.
Since this tracking is dependent on cookie tracking, ad-blocker software can break tracking. Advise your friends to disable AdBlock, uBlock, or similar softwares before they use your link to subscribe.
Full referrals FAQs can be found here: http://learning.firecracker.me/firecracker-referral-program-faq