Let me show you other ways in recording a refund, @Nina71.

The other way is to create a cheque to record the refund and reduce the balance of the account where the overpayment was deposited. Also, it offsets your customer's overpayment. Here's how: 

1. Go to the + New icon and choose Cheque.
2. In the Payee column, select the customer.
3. Choose Accounts Receivable in the Category column.
4. In the Amount column, enter the overpayment amount. 
5. Click Save and close.

Once completed, you can pair the check with the credit or overpayment. Here's how:

1. Go to the + New icon and choose Receive Payment.
2. Enter the necessary information. 
3. Under Outstanding Transactions, choose the Cheque that you created.
4. Select the Unapplied Payment under Credits. 
5. Make sure Amount Received is zero.
6. Click Save and close.

You can use this article for more detailed insights: Record a customer refund in QuickBooks Online.

If there's anything else that you need in recording your transactions, you can always leave a reply. You take care always!