WP EasyCart

WP EasyCart allows you to instantly sell physical goods, downloadable goods, gift cards, and merchandise quickly and easily from within your WordPress website. With support for AffiliateWP, you'll be able to create affiliate rules and assign them to multiple products and/or multiple affiliates.

To enable support for WP Easy Cart, go to  Affiliates > Settings > Integrations and check the box that says WP EasyCart: