Due invoices are invoices arising from sales with partial payment or credit payment, simply put, if a customer patronizes your outfit and either makes partial or no payment, this is a “DUE INVOICE”.
When the customer comes back to defray the debt, it’s referred to as “ADD PAYMENT”
The video and articles below explain how this works in detail.
In the above picture, the circled payment status is a “Due Invoice”
To add payment, click on the “Due” button
Next click on “Add Payment”
Add the amount being paid, payment date, and method, scroll down, and save.