The State Treasurer directly or through a state fiscal agent, or agents, shall, on the respective dates of maturity of all bonds, or on the date fixed for the prior redemption of any thereof which may be duly called for redemption, and on the respective due dates of all coupons pertaining to any of said bonds, other than coupons canceled because of the redemption of any of said bonds prior to maturity, or as soon thereafter as said bonds or coupons respectively are surrendered to him, or to such state fiscal agent, or agents, pay the same.