Drafting Instructions: Copy and paste the text portion of the model document onto appropriate letterhead. NOVI, MI 48375-3024.You just need to enter your details. This letter of Credit is irrevocable and transferable without charge upon receipt of your written instructions. 1. In the sample letter, fill in your personal information. If you are NOT a State of Michigan employee, you MUST select the Credit Card option. • Select credit card and select Continue. A creditor matrix contains each creditor's name and mailing address. This information is used for noticing and also for claims information when applicable. If in agreement, the payor can provide payment immediately.