Thank you for posting your invoice query in QuickBooks Online (QBO), @schmidt!.
Normally, the invoice will appear as paid once it is matched with the downloaded or imported payments from the bank feeds.
Once you receive the payment in QuickBooks Online, you can match the payment on the banking page. Make sure to verify that the date, amount, and account are the same to find a match for you.
If you want to mark the invoice as paid manually before getting the transaction from the bank, follow these steps:
1. Go to the +New button.
2. Select Receive Payments.
3. Select the name of the customer from the drop-down menu.
4. Enter the payment method and amount received.
5. Select Deposit and Invoice so it can be matched.
6. Make sure to review the amounts under the Payment column.
7. Click Save and close.
In addition, I've added to manage outstanding balances for customers and vendors in QuickBooks Online which might help you on your banking transactions.
If you have any other questions about your banking transactions, feel free to comment below. I'll be happy to assist you. Stay safe!