(a) The commissioners court, on the request of a county employee, may authorize a payroll deduction to be made from the employee's wages or salary for:
(1) payment to a credit union;
(2) payment of membership dues in a labor union or a bona fide employees association;
(3) payment of fees for parking in a county-owned facility;
(4) payment to a charitable organization; or
(5) payment relating to an item not listed in this subsection if the commissioners court determines that the payment serves a public purpose.
(b) In this section, "charitable organization" has the meaning assigned by Section 659.131, Government Code.