Professional, concise but firm email template for customers who have been on a/r aging report. I could benefit from account managers and professionals with experience writing these. Recently tasked with this with little experience. Any and all advice would be much appreciated!

Professional, concise but firm email template for customers who have been on a/r aging report. I could benefit from account managers and professionals with experience writing these. Recently tasked with this with little experience. Any and all advice would be much appreciated!