Merchants, Items, Customers) follow a consistent format: a prefix followed by a unique, URL-safe string.prefix_uniqueIdmer_AbCd1234, item_a1b2c3d4, ord_x1y2z3w4updated_at2025-10-16T14:05:00Z)._id throughout the documentation.Product record will contain an item_id to link it to the master Item record in our global catalog.