Hello Desktop2019,

It's good to know that your customer will pay you in person. This means you won't wait for the payment to process in your bank account.

When they pay you, you can open the invoice and enter the amount you receive in the PAYMENT AMOUNT field. If they want, you can print them a copy of the partially paid invoice. Then, they can just ignore the emailed invoice.

If you need anything else, feel free to comment below.