Md. Code, Business Regulation § 13–108

At least 90 days before a trading stamp company ends or suspends the redemption of trading stamps in the State, the trading stamp company shall:

(1) notify the Secretary of State in writing of its intention to end or suspend the redemption of trading stamps; and

(2) mail a copy of the notice to each retailer in the State that, within the previous 12 months, issued trading stamps that the trading stamp company is bound to redeem.