Payment Reminder Email Generator — illustrative example

INPUT
Invoice A17 for USD 250 was due September 10. The ledger still lists it as unpaid; tone requested is friendly.

RESULT
Subject: A quick check on invoice A17
Our records show USD 250 due September 10. Could you confirm the payment status? If you have already paid or need a correction, please reply so we can update the record.

REVIEW
A payment reminder should make the next action easy without assuming deliberate nonpayment. Confirm the invoice is still open and include the due date, amount and a private way to resolve disputes.

This is a teaching example, not a live execution record.