I appreciate you reaching out in the QuickBooks Community, info2312.
Let me guide you in correcting an invoice that was mistakenly marked as paid and in editing payment details if they were entered incorrectly.
To begin with, if an invoice was marked as paid by error, you can delete or void the payment transaction associated with it. Doing so will revert the invoice to an Unpaid status. Follow these steps:
- Navigate to Sales or Get Paid from the left menu and click on Invoices.
- Find and open the invoice that is marked as paid.

- On the invoice page, click on the linked payment.

- In the payment screen, select More at the bottom.
- Choose Delete or Void to remove the payment transaction.
- Confirm your action when prompted.

If the payment details were entered incorrectly, you can edit the payment transaction directly. Here’s how:
- Locate the invoice and click on the payment recorded link.
- In the payment record screen, update or edit the necessary details, such as the Payment method, Payment date, or Amount.
- Once you’ve made the changes, click Save to finalize your edits.
You can revisit this thread if you have follow-up questions.