You must complete these forms and print them to be returned to the bank. Please attached a VOIDED check or deposit slip to verify bank details and routing number.This form must be returned to: WSU - Disbursements - Suite 4100 AAB. The first step in using an ACH authorization form is to request this form from your bank or financial institution. The refund process will begin on the Monday or Tuesday following financial aid payment on your eBill. Connected bank account (ACH) fee. Once completed, the signed electronic payment authorization form must be submitted with either a voided check OR bank issued account verification letter.