Payment Demand Letter Creation

I need a professional letter of demand to request payment for an outstanding amount of less than $1,000. The letter should be clear, formal, and legally sound.

Requirements:
- Clearly state the amount owed
- Specify payment due date
- Include consequences of non-payment
- Maintain a professional tone

Ideal skills and experience:
- Legal writing expertise
- Prior experience with letters of demand
- Strong understanding of payment request language

Please include relevant experience in your application.