Returns
When a customer wants to return something and get their money back, use this workflow — don't just edit the order status.

Why go through the returns workflow
Editing the order status directly means stock isn't returned, the refunded amount isn't recorded in payment records, and the customer gets no notification. The returns workflow handles all of that in one go.
The flow
Request → you review → approved, customer ships it back → received and checked → refunded → stock restored
Question: How do I handle a partial refund?
Specify the items and the amount on the return request, and the system refunds only that portion. The rest of the order stays completed.