Overdue payment requested 미지불 결제상황 통지 & 결제통보 Subject: Settlement of invoice X432 Dear Sir / Madam, I am writing in connection with your invoice X432. According to our records there is still an outstanding balance of $2434.34 against this invoice. Payment is now 7 days overdue and we would be very grateful if you could contact us as soon as possible about this issue. We look forward to your promp..