If you do not have the option to process a refund through your CMS, or if the CMS does not support this feature, you will need to process the refund through the Merchant Back Office.
To process a refund through the Merchant Back Office:
- Sign in to the Merchant Back Office.
- Go to the Management > Transactions menu.
- Click the Captured transactions tab.
- Search for the transaction you wish to refund.
- Rick click and select Making a refund.
- Enter the amount to be refunded.
- Click Perform refund button.
Prestashop Magento WooCommerce