I have various clients who take deposits to book paid appointments, like tattoo artists and shops and recording studios. It would be great if they were able to load Invoices for payment through the point of sale, so when someone shows for an appointment where they've paid a deposit and an invoice has been generated, the remaining balance can be loaded into the point of sale. Then when they pay, the invoice is marked as closed. Right now, these clients must manually enter the balance owed if they want to take payment through the POS, and then there are a bunch of draft invoices left open.