In lieu of the Excise Tax bonding requirements this template may be used to request a Letter of Credit from your financial institution. How to use the template: 1.In the sample letter, fill in your personal information. A letter of credit shall be worded as follows, except that instructions in brackets are to be replaced with the relevant information and the brackets deleted. Get your free copy here! Below is a sample letter to help you craft your own letter. Send the letter via certified mail and keep the return receipt for your records. Our guide will teach you how to write a letter of explanation, plus offers a free template to help you write one of your own. How to use this sample letter: 1. Read the background below. 2.