1234, Main Street
Boston, MA 02123
03/16/05
<Recipient Address Goes Here>
Hello.
We have received your payment of <$amount> on invoice number <invoice number>. Because <reason for overpayment> you are due a credit of <$amount>.
<Handling of overpayment>.
If you have any questions, please feel free to call us at <phone number>.
Regards,
Robert Anderson
encl: <List of enclosed items goes here>