MemberPress Affiliate Royale GPL Overview:

Easy Affiliate is a complete affiliate program plugin for WordPress, designed by the creators of MemberPress. Use it to start an affiliate program for your membership site to increase traffic, attention, and sales dramatically. Maintain total control and avoid 3rd-party fees on profits.

With Easy Affiliate you can track your affiliates to see how they’re doing, see how many clicks they’re driving and sales they’re making, and know how much to pay them. This plugin integrates seamlessly with every edition of MemberPress.