The Affiliates manager plugin can be integrated with the paid membership pro plugin so you can reward affiliates for sending members.
Step 1 (Install the Integration Addon Plugin)
Download and Install the Paid Memberships Pro Integration addon.
Step 2 (Keep the Main Plugins Active)
Simply keep the Affiliates Manager and the Paid Memberships Pro plugins active in your WordPress site.
The affiliate plugin will track all the referrals and give commission accordingly if a referred user pays for a membership.