Dear [Customer's Name], We hope this letter finds you in good health and high spirits. We would like to bring to your attention that as of today's date, we have not received the payment for your outstanding invoice [Invoice Number] dated [Invoice Date] for the amount of [Invoice Amount]. At [Company Name], we understand that unexpected circumstances can sometimes cause delays in payments. However, it is important to note that invoices should be settled within [Payment Terms] days of the invoice date, as stipulated in our agreed-upon terms and conditions. We kindly request you to prioritize the settlement of the outstanding amount to ensure the smooth continuation of our business relationship. Your timely payment will enable us to maintain our services and provide you with uninterrupted support. To make the payment process convenient for you, we have enclosed a copy of the invoice with this letter. You can settle the amount via [Payment Method], or if required, reach out to us at [Contact Details] to discuss alternate arrangements. We are more than willing to assist you in any way possible to resolve this matter promptly. We understand that oversights occur, and it is possible that you may have forgotten about this invoice. Therefore, we kindly urge you to address this overdue payment within the next [Number of Days] days. In case you have already made the payment, we sincerely apologize for any inconvenience and kindly request you to disregard this letter. Please note that failure to settle the outstanding amount within the specified timeframe may result in further actions, such as interest charges, collection agency involvement, or potential legal proceedings. We believe such measures can be avoided if we work together to resolve this matter amicably. At [Company Name], we highly value our customers and aim to maintain long-lasting partnerships. We trust that this reminder serves as a means to keep our accounts in order for both parties involved. We appreciate your prompt attention to this matter, and thank you for your continued support. Should you have any questions or concerns regarding this matter, please do not hesitate to reach out to us. Our dedicated team is here to assist you and find a suitable solution. Your immediate attention to this matter will be greatly appreciated. Thank you. Sincerely, [Your Name] [Your Title/Position] [Company Name] [Contact Details: Phone, Email]