Initiating a Refund
You can initiate a refund from within your form entries for the Square Add-On. Any entry which has collected payment (has a status of Paid), will display a Refund Payment option in the Payment Details section of the entry detail.
Clicking that button will refund the payment (via your Square service) and then update the screen with details about the pending refund.
Notification on Refund
If you have the Square Add-On installed, then notifications can be sent on the event of Payment Authorized, Payment Capture Failed, and Payment Refunded.