You can pay available credit out as a refund from a customers card or from a closed RMA. This will remove the credit from the customer card but will not physically pay the refund to the customer. It is still your responsibility to pay the customer the money owed using the method they request.
Steps for refunding a customers credit:
Here you will see a list of available credits
Please Note: You must still pay the refund to the customer as per the payment method chosen. If you are using a payment gateway or Paypal login to your payment gateway or Paypal account to process the payment.