type: object description: The details to update of the line item. properties: unit_price: description: >- The custom price of the line item. If a `variant_id` is supplied, the price provided here will override the variant's price. type: integer title: description: The title of the line item if `variant_id` is not provided. type: string quantity: description: The quantity of the line item. type: integer metadata: description: The optional key-value map with additional details about the Line Item. type: object externalDocs: description: Learn about the metadata attribute, and how to delete and update it. url: >- https://docs.medusajs.com/development/entities/overview#metadata-attribute