Cal. Business and Professions Code § 17768

Any merchant who has issued to his or her customers or other persons the trading stamps of any trading stamp company subject to this chapter, and who proposes to discontinue the issuance of the stamps of that company for any reason, shall post a notice in at least 18-point type at every location in his or her establishment where stamps were or are issued, containing at least the following information: (a) The fact that trading stamps will no longer be issued by the merchant and the date of discontinuance of issuance. (b) The name and address in this state of the trading stamp company that is responsible for the redemption of those stamps. (c) The fact that the stamps are redeemable either in merchandise, service, or in cash, at the option of the holder, and stating the cash redemption value of each stamp, and that it is necessary for the holder to present stamps in an amount aggregating not less than one dollar ($1) for redemption in cash. (d) The notice required by this section shall be posted at least seven days prior to the date on which the issuance of trading stamps is discontinued, and shall remain posted for 30 days after that date.