{ "type": "object", "description": "An item in the shopping cart.", "properties": { "cart_item_id": { "type": "string", "description": "Unique identifier for the cart item.", "example": "500123" }, "catalog_item_id": { "type": "string", "description": "The sys_id of the catalog item.", "example": "500123" }, "quantity": { "type": "integer", "description": "The quantity ordered.", "example": 10 }, "subtotal": { "type": "string", "description": "The subtotal for this cart item.", "example": 42 } }, "$schema": "https://json-schema.org/draft/2020-12/schema", "title": "CartItem" }