Let's ensure the invoice remains open and that no bank transactions match, @stillup.

Before we proceed, could you confirm whether you receive an error message?

In QuickBooks Online (QBO), there isn't a simple Mark as Paid button directly on the invoice itself, like you might expect.

However, there are several ways to mark an invoice as paid in the system. You can go to the Sales tab, the dashboard, or the customer transactions list.

Here's how to do it:

1. Go to the My Apps menu, select Sales & Get Paid.
2. Choose Invoices.
   
   
3. Find and open the invoice you want to mark as paid, or directly click on Receive payment.
   
   
4. A new Receive Payment screen will open, and all details should automatically populate.
5. Click Save and close after.

To manually mark an invoice as paid in QBO, navigate to the Receive Payment section.

Here's how:

1. Click + Create and select Receive payment.
   
   
2. Fill in the required information.
3. In the Outstanding Transactions section, check the box/es for all open invoices.
   
   
4. Click Record and close.

If you know the customer, follow these steps:

1. Go to the My Apps tab, select Sales & Get Paid.
   
2. Click on the customer to view their transactions.
   
   
3. Find the invoice, and choose Receive payment.

For more details, refer to the article: Record invoice payments in QuickBooks Online.

After that, visit the Sales and Get Paid tab to confirm paid invoices.

If you have any other questions or concerns, please reply to this thread.