This is the XF 2 version of Referral Contest. If you are looking for a simpler referral system, check out my Referral System add-on. Referral Contests allows you not only to create referral contests for your members, but you can also make your board invitation only. Referral contests are...

Admin options Referral URL parameter - Set a custom parameter for referral links. Track HTTP referrer - Track the address of the page (if any) which referred the user to the referral link. Use profile page as referral link - The user profile page will become the referral link. Enable custom...