AffiliateWP Store Credit Addon GPL Overview:

Pay your affiliates with store credit! Simply install the add-on and the next time you mark an affiliate’s referrals as paid, they will receive store credit. When an affiliate adds a product to the cart and proceeds to checkout, they will have the option of spending their store credit. The Store Credit add-on supports WooCommerce and Easy Digital Downloads. Note: using Store Credit with Easy Digital Downloads requires the EDD Wallet extension. It can be purchased from the Easy Digital Downloads website.

Features:

• You can enable Store Credit for all affiliates or just a few.
• You can allow your affiliates to opt-in for Store Credit within the Affiliate Area.