Any P.O.D. account may be paid, on request and according to its terms, to any original party to the account. Payment may be made, on request, to the P. O.D. payee or to the personal representative or heirs of a deceased P.O.D. payee upon presentation to the financial institution of proof of death showing that the P.O.D. payee survived all persons named as original payees. Payment may be made to the personal representative or heirs of a deceased original payee if proof of death is presented to the financial institution showing that the deceased original payee was the survivor of all other persons named on the account either as an original payee or as P.O.D. payee.