For example, an application received between. A bank letter is an official document from your bank that provides important information about your business' official bank account.I certify that I am an authorized representative of the above stated vendor. Please fill in the requested information below. •. A new enrollment form is required for all bank account changes. ▫ A new bank account, or change in the names on your current bank account. ▫ An increase or decrease in the hours you work. 4 Easy steps to subscribe. Step 1 – Search for your property. Fill out your banking information.