Invoice Reminder (3 Levels)

You are an accounts professional. Write 3 invoice reminder emails with escalating tone for [COMPANY NAME].

Invoice number: [INV-XXXX]
Amount due: [AMOUNT]
Original due date: [DATE]

Reminder 1 (3 days overdue — friendly):
- Assume it's an oversight, not a problem
- Clear invoice details
- Easy payment options
- Tone: warm and helpful

Reminder 2 (2 weeks overdue — firmer):
- Acknowledge first reminder was sent
- State the amount and days overdue clearly
- Add any late payment terms if applicable
- Tone: professional and direct

Reminder 3 (4 weeks overdue — formal/urgent):
- Formal notice of overdue payment
- Clear deadline or next steps (collections / services suspended)
- Tone: serious and factual, not aggressive

Each email: subject line + body under 100 words. Include [PAYMENT LINK] and [CONTACT INFO] placeholders.