Fill out this bank confirmation letter on Lawrina and download a fully customized PDF document, ready for resolving your legal matters. A bank confirmation letter (BCL) is a correspondence between banks that confirms the existence of a valid line of credit to one of its customers.The verification letter must have a customer's account number, name, outstanding balance, opening date, and bank's name and address. In this article, we discuss how to write a conformational letter, look at sample templates for formal and informal confirmation letters and share some tips. As you can see, the bank letter example above has all of the required components (date, name of bank, account name, account number, routing number). Main_bank-confirmation-letter-template - Free download as PDF File (. These templates include all the necessary information required in order to receive a valid and accurate letter from the bank.