A referral link is a link which lets the manager and the manager’s partners keep track of the investors referred to the PAMM Account.
After a partner is added to the PAMM Account, they will be able to find their referral link by clicking the "PAMM Partner" icon in the "Partnership Networks" section of myAlpari. This link can be placed on a partner's website to keep track of their referral of investors to the PAMM Account. If an investor decides to open an investment account after clicking on the referral link, both the manager and the partner will be informed in myAlpari
Source: alpari.com, "What is a referral link and how does it work?"