Affiliate plugin custom integration

In the Affiliate Plugin Usage section it says, "The Affiliates plugin is very powerful out of the box, integrating with many WPMU DEV plugins. But you can also with only a few lines of code integrate with other WordPress plugin’s or setups. Checkout our basic tutorial on creating your own custom integration."

Going to the referenced article at https://premium.wpmudev.org/blog/integrating-the-affiliate-plugin-part-one/, the instructions are all about using the WPMU system, the Supporter paid option, etc., and has nothing for integrating with a different solution.

I am wanting to have an affiliate program using the Paid Memberships Pro (http://www.paidmembershipspro.com/) because it allows the Stripe payment method, which WPMU Membership does not allow. Is there any place online with actual custom integration instructions?

Thank you.