ACH Authorization Form. Fill out and submit the form according to your bank's instructions. Advertisement.Letters of Administration are court orders issued as part of Formal Administration cases. Complete the Department of State's Apostille and Notarial Certificate Request Form. Enclose the document to be authenticated or certified. A medallion signature guarantee must be completed in person because it confirms your identity, signature and legal authority to transfer securities. An authorisation letter is written to the bank's branch manager.