How do I adjust the sum of money that should be refunded to a customer?

How do I adjust the sum of money that should be refunded to a customer?

The RMA extension doesn’t deal with a refund itself. It works only with refund requests, so everything about sending money to customers should be performed by the admin manually via the default Magento Credit Memo option. As a quick way to create the Credit Memo for RMA, you can use the Credit Memo button located right on the RMA request details page. 

Step 1. Please navigate to Sales → Manage Requests → choose the request and click Credit Memo. This option will redirect you to the default Magento Credit Memo page for the original order of the refund request. 



Step 2. Scroll down to the Order Total → Refund Totals block, where you can use the Adjustment Refund option to define the amount of money that should be refunded.