You should refund the buyer within 48 hours upon receipt of the refund request, otherwise, Amazon will take action and charge it subsequently to your seller account and this will have a huge performance metric repercussion on your part and will definitely affect your Return Dissatisfaction Rate (RDR). Here’s some information about RDR.
The Return Dissatisfaction Rate (RDR) is the percentage of valid return requests that were not answered within 48 hours, were incorrectly rejected, or received negative customer feedback.
RDR measures customer satisfaction with how you processed their returns. It consists of three individual components:
Negative Return Feedback Rate
Late Response Rate
Invalid Rejection Rate
Sounds like a pain but this will definitely help sellers provide the best possible customer service experience on returns. Now, you don’t have to print the return shipping label yourself since Amazon took that workload off your plate by allowing buyers to do it themselves.