Dear [Customer's Name], We hope this letter finds you well. We are writing to address the outstanding payment for your recent purchase with our company. According to our records, we have not received the payment for [Product/Service] in the amount of [Amount Due], which was due on [Due Date]. We understand that delays can occur, but it is important for us to maintain a healthy cash flow for our business. Therefore, we kindly request immediate payment of the outstanding amount. To facilitate the payment process, please find enclosed the necessary invoice and payment details. As a valued customer, we appreciate your business and would like to inform you about an available discount on your invoice. However, please note that due to the past-due status of your payment, we regret to inform you that the discount can no longer be honored. Our policy states that all payments must be received by the specified due date to qualify for any discounts or special offers. To avoid any further inconvenience, we urge you to settle the outstanding amount as soon as possible. You can make the payment via [Payment Method] using the following details: — Account Name: [Account Name— - Account Number: [Account Number] — Routing Number: [Routing Number— - Amount Due: [Amount Due] Upon receipt of the payment, we will promptly update our records and mark your invoice as paid. Should you require any clarification or assistance regarding this matter, please do not hesitate to contact our dedicated customer support team at [Customer Support Contact Details]. We understand that unforeseen circumstances may arise, causing payment delays. If you require any flexibility in making the payment or need to discuss alternative payment arrangements, please let us know. We are willing to work with you to find a mutually beneficial solution. Thank you for your attention to this matter, and we look forward to receiving your prompt payment. We value your continued partnership and hope to serve you again in the future. Yours sincerely, [Your Name] [Your Designation/Position] [Company Name] [Company Address] [City, State, ZIP Code] [Phone Number] [Email Address] [Optional: Enclosure(s) — Invoice Copy]