I need to refund a customer who’s payment was already deposited, please help!

Hi there, @tricities.

You can send your customer a refund receipt in QuickBooks. I'd be glad to show you how to do that.

1. Go to the + New button and select Refund receipt.
2. Enter the customer's name and the Payment method.
3. After that, enter your bank in the Refund from field. You can also enter a check number.
4. Fill in the important details and select Save and send.

Here's a screenshot for your additional reference:

There's an article that shows a video for more information about giving your customer a refund in QuickBooks: Record a customer refund in QuickBooks Online. You can also click on the hyperlinked article about how to refund credit card payment in this reference page.

Moreover, please refer to these articles when entering bank fees and matching your bank transactions in QuickBooks: Enter a bank service fee while using a third-party merchant service and Categorize and match online bank transactions in QuickBooks Online.

Please don't hesitate to tag my name in the comment section below if you have other concerns or questions. I'd be happy to back you up. Stay safe and have a wonderful day.