The issuance of a credit card to a member of the governing authority or municipal employee under the provisions of this section does not authorize the member of the governing authority or municipal employee to use the credit card to make any expenditure that is not otherwise authorized by law. Any member of the governing authority or municipal employee who uses the credit card to make an expenditure that is not approved for payment by the governing authority shall be personally liable for the expenditure and shall reimburse the municipality. The employee shall be subject to all interest and fees and other charges related to the collection of expenditures not approved by the governing authority.