In order to make a bank authorization letter, it's important to empower someone with bank relates issues, for example in taking collecting or sign on documents. Formats and Samples of Writing an Authorisation Letter to Collect Documents.How to fill out the Sample Authorization Letter for FRG Checking Account? 1. Gather necessary information about your FRG. 2. Contact your bank for a power of attorney form. Screenshot of the first step in the claim process of the Unclaimed Funds application. The BMO Authorization Form is a document that allows for automatic monthly withdrawals from a bank account to cover premiums, including overdue premiums. You'll see a page that summarizes Online Banking features and benefits. Select the "Sign Up Now" link and follow the online steps to complete the application.