In all counties of class three and four which shall enter into an agreement with the state agency to place county employees under the Federal Social Security Act in accordance with the provisions of sections 105.300 to 105.430, it shall be the duty of the county clerk to keep necessary records, collect contributions of county employees, and do all other administrative acts required by the agreement or by ruling of the federal or state agency in order to carry out the purposes of the aforesaid law.