Complete the ACH Credit Payment Method Authorization Agreement or the ACH Debit Payment Authorization Agreement. A bank letter is an official document from your bank that provides important information about your business' official bank account.Checking (Provide a voided check or bank letter that includes your routing and bank account number). Depending on the information request, DST will either complete the vendor's form or provide a general statement. Peoples Bank lets you automatically make and collect payments for your North Carolina business using Online Cash Management. The University of North Carolina at Chapel Hill.