Write a 3-email invoice follow-up sequence for an overdue invoice:

- **Client name:** [Client First Name or Company Name]
- **Invoice amount:** [$XXX]
- **Invoice number:** [INV-XXXX or leave blank]
- **Invoice due date:** [date]
- **Payment methods accepted:** [check / ACH / credit card / online link]
- **Your contact for questions:** [phone or email]
- **Business tone:** [friendly and professional / direct and firm]

**Email 1 — Friendly Reminder (3–5 days past due)**
- Assume it's an oversight
- Light, warm tone
- Include payment details and how to reach you

**Email 2 — Firm Follow-Up (10–14 days past due)**
- Professional and direct
- Reference the prior email
- Set a specific payment deadline (e.g., "by Friday")

**Email 3 — Final Notice (21–30 days past due)**
- Serious tone
- State clearly that this is a final notice
- Indicate the next step if not resolved (collections agency / late fee / pause of services)

Each email should be under 150 words. Subject lines included for each.
Invoice Follow-Up Sequence
