To start, open the WooCommerce App and click the Order you wish to refund.
At the end of the new display, you will find a button to Create Refund.
Enter an Amount, a Reason and click Issue Refund.
Please note, not all WooCommerce payment gateways support refunds and you may be required to manually refund via your payment gateway as well. We recommend you review your orders in WooCommerce and your payment gateway to ensure that money has been returned to your customer.