The affiliate system (affiliate program) of WHMCS is an interesting marketing option because, unlike e.g. When advertising in search engines or on websites, do not have to go into prepayment and only then have to pay a commission if it really comes to an order.
Typically, your partner will receive a Werbelink with a unique ID, which he can use e.g. On its website. If you click on this link, a cookie with the ID of your partner will be placed at the visitor of the website. As soon as an order is placed, the partner is then deposited in the system as advertiser by the cookie, thus obtaining the defined commission.