The Referral program is an agreement involving two or more parties (for example, company and webmaster) that work in conjunction to provide some kind of benefits to each other. The main goal for webmaster is to earn commissions for mentioning or recommending the company’s services or products. Usually, webmasters place the company’s advertisement on their individually owned websites. When an online visitor clicks the referral link, the sale is tracked by calculating the referral bonus for webmaster.