Referrals. They work with other companies, and these companies give them a unique code to apply for discount. When users use these code they get a commission.

Referrals. They work with other companies, and these companies give them a unique code to apply for discount. When users use these code they get a commission. It's like CJ (commission junctions www.cj.com) that many other websites such as slickdeals uses. I used to work for one of these start up that does slickdeals like websites. They're exactly like Rakuten. You use their browser extension and they'll apply the code for you automatically. I believe all of these codes are via cookies.