Buy Now Button purchases are not tracked in the Buy Now Plus website, it is all in Stripe, so first navigate to Stripe.com and login there.
Then if you have multiple Stripe accounts choose the one you use with Buy Now Plus from the drop down on the top left of the page.
Navigate and login to Stripe.com then click on the “Customers” icon from your dashboard.
A list of all your customers will appear on the right.
Login to your Stripe.com account, then click on the Payments option in the left sidebar. A list of all your payments will appear, then choose the one you want to refund.
Once inside the payment details, you will see a “refund” button on the top right of the screen. Click that to activate a pop-up.