1. In the sample letter, fill in your personal information. A "sample" Letter of Credit format is on the Department of Permitting Services (DPS) website.FC Letter of Credit Template. See a sample credit dispute letter below. Mortgage lenders might request a letter of explanation for various red flags that come up in underwriting. Learn how to write one, and download a template. In this article, we discuss how to write a letter with two signatures and provide an example letter for you to use as a reference. Example: Selena falls behind on her credit card payments, and after several months of missed payments, the card company marks the account as a charge-off. This class will help you learn how to fill out the form. Watch. For example, do not provide an evaluation of the employee's work.