Chasing unpaid invoices is one of those jobs that's simple but never stops: remember who you invoiced, remember who paid, remember who's overdue, then write the reminder. It's exactly the kind of repetitive tracking that's easy to build a workflow around.

What the real version of this does

1. You log an invoice with one line of text when you send it: customer, amount, due date.
2. You log a payment, a hold, or a correction the same way, whenever it happens. Never a guess if the line is ambiguous, just a clarifying question back to you.
3. Every morning, it reads the whole ledger, nets off payments and corrections, and emails you a digest: a money summary at the top, then a ready-to-forward reminder for each overdue invoice, ordered most urgent first, with the tone escalating the longer it's been outstanding.
4. Nothing goes to your customers automatically. You paste the ready-made reminder into your own email thread with them, so they hear from you, not a robot.

One honest limit: it doesn't yet remember that it already reminded you about the same invoice yesterday, so a reminder can repeat in the digest until you've dealt with it. You just skip the ones you've already sent.