A certificate shall be valid only after the administrator's stamp or endorsement has been affixed thereto indicating payment has been received of the amount of the tax and penalties thereon, if any. A certificate, however, which has been paid for by a check or bank draft which was subsequently dishonored by the bank upon which it was drawn shall not be a valid certificate even though the administrator's stamp or endorsement appears thereon, and the person operating the business for which the certificate was issued shall be deemed to be operating without a valid certificate and shall be subject to the penalties provided in this chapter for so operating. (Prior code § 23.02.202)