A synthetic letter of credit (SLC) is a pre-funded, negotiable instrument that guarantees a specified payment will be rendered. 1. In the sample letter, fill in your personal information.Basic Letter of Credit Concepts. –. The applicant was denied a credit card. The application was incomplete or could not be verified based on the information provided. A letter of credit facility is a contract between a buyer and seller where the bank guarantees payment upon presenting certain documents. Letter of Credit Specialist: Salt Lake City, UT in Full Time, Other with Enterprise Services. Learn how credit reporting works and how you can dispute inaccurate items on your credit report through Capital One. New opening - Full-time Letter of Credit Specialist: Salt Lake City, UT at Zions Bank position hiring now. National Bank of Arizona Cash Back Program.