A) Go to the RMA Setting -> Refund product Setting -> Enable Auto Accept Product Refund Request.
Enable Auto Accept Product Refund Request: If the admin enables the Auto “Accept Product Refund Request” then Refund Request is auto-approved after some period of time.
Minimum Number of Days for Auto Accept: If Refund Request submitted within the selected number of days then Refund Request is auto-accepted otherwise rejected.
If the value is 0 or blank then the Refund policy does not work.