An approved invoice can schedule reminders for its due date and selected intervals after the due date such as 3, 7 or 14 days.
Reminders run in the background only for eligible unpaid invoices with a valid customer email and enabled setting. The message identifies invoice, amount, due date, business and payment instructions. If delivery fails, verify customer email, payment state and schedule. Repeated or missing reminders should be escalated with the invoice number.