Is there functionality available to automatically refund the credit memo that is created from an RMA

Release 12.1.3
I would like to know if there is a functionality available to automatically refund the credit memo that is created from an RMA order from order management.

You can automate the refund process if the original sales order invoice is paid. But in the customer's case they do not have the reference of the original sales order. He wants to use an automatic process to refund the on-account credit memo either by direct debit or by check.

Here is the scenario:

1. Create an RMA order from order management (No sales order/Invoice reference information provided)
2. Receive the RMA and close the order