Cal. Bus. & Prof. Code § 17762

Any trading stamp company shall redeem upon presentation any trading stamp that it has issued, either in merchandise, service, or cash, at the option of the rightful holder. However, if the trading stamp company only offers to redeem the trading stamp in cash, the rightful holder of the trading stamp shall not have the option of receiving merchandise or service and shall only receive a cash redemption. Trading stamps shall only be presented for redemption in cash in an amount aggregating not less than one dollar ($1).