Request for ACH Payment. Name and address of your bank as shown on the sample check above.Bank Routing Number, 9 Digit Bank Routing Number as shown on the sample check above. Please attach a voided check or bank letter to the form in confirmation of the above account. Enter the specified three numbers below: Vendor Number. Invoices are paid online via card or ACH. 221476688 is a routing number used for NASSAU FINANCIAL FEDERAL CU in NY. This routing number supports ACH and Wire transfers. Bank letterhead; Account number; Routing number; Business name. If you do not have your tax statement or account number, please hang up and call our office (516) 869-7800 and dial 0 for our Customer Service Desk. Where do I go to complete my registration or change my information?