A bank letter is an official document from your bank that provides important information about your business' official bank account. What forms should vendors use to submit bank information for the EFT process?Fill in the details for your new template. Include Source Account, Description, and default amounts for each recipient who should be included. How do I sign up for Direct Deposit? Fill out this authorization agreement along with verification from the bank showing the account number and routing numbers. Silver Bank of Nevada. Step 1: Identify The Funds Or Asset You Want To Collect. We have several forms that you can download and fill out. Need help setting up or understanding direct deposit?