type: object
required:
  - quantity
properties:
  variant_id:
    description: The ID of the Product Variant to generate the Line Item from.
    type: string
  unit_price:
    description: The potential custom price of the item.
    type: integer
  title:
    description: The potential custom title of the item.
    type: string
    default: Custom item
  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