All disbursements in discharge of township indebtedness duly incurred shall be made by the township treasurer or the treasurer's deputy, by virtue of warrants or orders drawn on the treasurer by the order of the board of commissioners, signed by the president or vice president and attested to by the secretary or assistant secretary of the board. The board shall prescribe, by ordinance, the manner in which bills for township indebtedness shall be approved for payment.
53 P.S. § 56708