PayPal Payouts allows you to instantly pay your affiliates their earnings from your PayPal account with a single click.

AffiliateWP Store Credit Addon GPL – 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.