How AI describes Smile Makers Collection

An e-commerce discount automation module that maps marketing campaigns (via utm_campaign) to discount codes and applies them to the shopping cart automatically. It builds a campaign-to-discount lookup, persists the active campaign in sessionStorage, and removes stale codes when no campaign is active, while guarding against recursive cart updates. It also notifies other components of campaign changes and ensures the discount state is preserved across pages, supporting promotions like Black Friday.