If you want to refund an order paid with YITH PayPal Payment, just open the order details and click on the Refund button that you find in the order recap metabox.
You can choose whether to refund the full amount or a partial amount.
The transaction number will appear in the order details and it will be automatically synced with your PayPal account, so, you will be able to see the refunded amount there as well.
