Automated Invoice & Payment Reminders

What just happened: Invoice #10482 emailed itself on the due date with a pay-now link. When it went unpaid, a text reminder fired at day 3, then a second email reminder at day 7 with the pay link repeated. As soon as Marcus paid through the link, the invoice was marked paid and a receipt sent automatically. Note that every later step is conditional — if payment had come in right after the invoice was sent, or after the day-3 text, the remaining reminders simply would not have fired. The sequence only runs as far as it needs to.