Vendors doing business with the State of Arizona who desire to receive ACH payments must complete an ACH Vendor Authorization Form (GAO-618). A bank letter is an official document from your bank that provides important information about your business' official bank account.To have a Treasury Management representative contact you, simply complete the form below. The State of Arizona shall deposit the ACH payments in the financial institution and account designated below. Electronic Funds Transfer (EFT) Disclosure Agreement, for ACH Credit Filers, from azdor.gov. Part 5 - Authorization: List at least one authorized signer and up to two additional authorized signers. The best way to select the date and time for your training is to choose a time you plan to complete a live transaction with ACH, Wire or Positive Pay.