The processed orders (i.e., money captured and the subscription is created) can be refunded via the corresponding invoice. To refund the processed order (such orders have the "Complete" status), go to the Commerce Director - Online Payments Documents - Processed Documents list and select an order. As the order details appear, in the General Information part of the form click on the order ID and then click the Payment History tab. The corresponding invoice(s) appear. Click on the invoice ID and as the invoice details appear, click on the Refund button.
When you refund the completed invoice, you can select an action that will follow the refund. To select an action under the corresponding subscription, account, or credit card used to pay an invoice, set the option button to one of the variants available for each object: