OptionaldiscountsOptionalpriceThe ID of the price object. One of price or price_data is required.
Optionalprice_Data used to generate a new Price object inline. One of price or price_data is required.
OptionalquantityThe quantity of the line item.
Optionaltax_The tax rates which apply to the line item. When set, the default_tax_rates on the quote do not apply to this line item.
The discounts applied to this line item.