The Gazelle | QuickBooks Online integration pulls transaction details from Stripe payouts (which include both payments and refunds) and pushes these transaction(s) to QuickBooks so you can easily reconcile your accounts.
Here is how Gazelle handles refunds between Gazelle | Stripe | and QuickBooks:
In QuickBooks: Gazelle records this transaction as a refund receipt. This will debit your 'Undeposited Funds' asset account so your accountant can match the amount reported on your bank register.
In QuickBooks: Stripe refunds do not always tie back to a customer in QuickBooks so there is a chance this transaction might already be tied to a customer, there is also a chance you will need to ask your accountant to manually adjust the QuickBooks customer assigned to this refund receipt.
(Optional) - In Gazelle: You might consider making a note on the Gazelle invoice indicating that this invoice was refunded in QuickBooks (and for future reference also consider linking back to the QuickBooks refund receipt transaction ID associated with this refund).
PRO TIP: Deleting or adjusting previously cleared transactions in either QuickBooks or Gazelle will cause bookkeeping challenges and will most likely create extra challenges for your CPA as they try to unravel the bookkeeping mess it causes. If you have questions about how to handle a specific transaction, ask your accountant for advice.