Chasing an unpaid invoice
An invoice becomes overdue the day after its due date, which is worked out from your payment terms rather than typed in. Nothing chases anybody automatically: reminders go when you send them.
See what is outstanding
Unpaid invoices are grouped by how late they are, because a week late and three months late are different problems and want different letters.
Send a reminder
Reminders are drafted for you with the invoice attached, and you read them before they go. You can send one, or send to everybody who is overdue at once, and either way you see the list first.
When the money arrives
If it comes through a connected bank account, the feed matches it and the invoice settles itself. Record it by hand when it arrives another way, which is usually a cheque, a card machine or a payment split across two transfers.