TRADING STAMPS ‑- REDEEMABLE IN MERCHANDISE ‑- APPLICABILITY OF LICENSING REQUIREMENTS The licensing requirements of chapter 36.91 RCW apply to a retail store which (1) issues trading stamps redeemable in Washington in cash only, but (2) through its employees informs its customers that such stamps can be redeemed for merchandise in another state and (3) in which state they are in fact redeemable.