Overview
When not connected to QuickBooks a sale is marked as complete by finalizing it, which prevents further editing.
Process
After editing a retail sale, you are taken to the Finalize screen. You will be prompted to enter a payment reference number (optional) from your payment processing system. If you are not connected to QuickBooks, click the Process + Payment button to finalize the sale.
If you are connected to QuickBooks, after entering a payment information click the Submit to QuickBooks button.
Note that Retail Sales originating from Square (if connected to your Square Payments account) will have the Square Payment reference number automatically populated.
Instead of finalizing sales one by one, you can use the bulk finalize feature to process many sales at once.