Hello uppercutyyc,
QuickBooks Online enables you to edit customer invoices, so their account remains accurate. When a payment has been applied by mistake, it can easily be resolved. I would be glad to assist!
Follow these steps to remove the payment;
1. From the left menu, open +New then Invoice
2. Click on the history icon in the top left (looks like a clock)
3. Scroll down and hit View more
4. Select the invoice from the list to expand the view
5. In the top right, click on the Payment
6. Click on the Date for the payment you need to remove
7. At the bottom, open More, then Delete
This will detach the payment from the invoice, so the customer balance is accurate and aligned with your books.
If you have any other questions, please feel free to reach out again. We would be happy to help!