Hi there,
Thanks for joining us in the Community. QuickBooks is a flexible program that helps you achieve your accounting goals. I'll be glad to help share more info so you're on the right path.
If you'd like to refund amounts back to a customer in QuickBooks, check out the following article as it shows you how to: Void or refund customer payments in QuickBooks Online. You can also record the record a customer refund using the guidance provided in this article here.
Let me know if you have other questions,. I'll be here in case you need anything else. Otherwise, I wish you a great rest of the week.