Contact your bank for a power of attorney form. Formats and Samples of Writing an Authorisation Letter to Collect Documents.Learn how to write an authorization letter, granting permission to someone to act on your behalf in a legal or formal capacity. What are the guidelines to write an authorization letter? Check out this Letter of authority bank sample for your reference. Authorization letters are formal letters that empower somebody else to take actions on your behalf. Sample of Notice: PDF icon MSXI - Sample Notification Letter. This letter, addressed to an institutional representative, allows the bank to know that the person holding the letter is operating with your permission. Irma Clark-Coleman (Dist. Certificate of Authority for Foreign Limited Liability Company.