1. In the sample letter, fill in your personal information. This letter explains my credit history and why it is currently at (include your current or estimated credit score).A mortgage lender might ask you to write a letter of explanation to better understand your finances when deciding whether to approve you for a loan. Writing a debt validation letter can keep you from paying a bogus debt collection. A credit card authorization letter gives someone permission to use your card. Learn how to write one, and when it's appropriate to use it. Citing a letter, memo, or other correspondence ; A print letter ; Note. 1. Charles Hanson to Nancy McPhaul, August 22, 2008. Through a partnership with City Colleges of Chicago (CCC), juniors and seniors can earn college credit while completing high school graduation requirements. When you complete the work, you expect to make what you saw advertised, right?