Dunning email sequence (all four steps)

Subject: Invoice {{invoice_number}} from {{business_name}} is due {{due_date}}

Hi {{customer_name}},

A quick heads-up that invoice {{invoice_number}} for {{amount_due}} is due on {{due_date}}.
You can pay online here: {{payment_url}}
Your full statement is here: {{portal_url}}

If it's already scheduled, please ignore this.

Thanks,
{{business_name}}

Subject: Overdue: invoice {{invoice_number}} ({{amount_due}})

Hi {{customer_name}},

Invoice {{invoice_number}} for {{amount_due}} was due on {{due_date}} and looks unpaid on our side.
You can settle it in a couple of minutes here: {{payment_url}}
If payment is already on its way, or if something about the invoice doesn't look right, just reply and we'll sort it out.

Thanks,
{{business_name}}

Subject: Second notice: invoice {{invoice_number}} is {{days_overdue}} days overdue

Hi {{customer_name}},

This is a second reminder about invoice {{invoice_number}} for {{amount_due}}, now {{days_overdue}} days past its {{due_date}} due date.

We'd like to get this resolved this week. If there's a problem with the invoice or you need to discuss timing, reply to this email and we'll work it out.
Pay online: {{payment_url}}
Your statement: {{portal_url}}

Regards,
{{business_name}}

Subject: Final notice: invoice {{invoice_number}} ({{amount_due}}, {{days_overdue}} days overdue)

{{customer_name}},

Despite previous reminders, invoice {{invoice_number}} for {{amount_due}} remains unpaid {{days_overdue}} days after its due date of {{due_date}}.

Please arrange payment within 7 days of this notice. If we don't hear from you, we'll have to consider our options for recovering the balance, which may include late fees where your agreement provides for them.
Pay now: {{payment_url}}
If you believe this is in error, reply immediately.

{{business_name}}