The My Coke Rewards codes expire after 90 days if the account is inactive during this time. Inactivity means the person registered has not spent any points or entered a code within this period of time.
Email notifications are sent periodically to inform the registered person when the expiration date is coming up. My Coke Rewards allows people who buy participating Coke products to win more products, cash and prizes. There is a reward code under every bottle cap, which the purchaser enters on the website. The purchaser must first register an account to enter the codes and redeem points.