The item details.
item_unit_priceobject<money>Optionalcurrency_codestring<currency_code>RequiredvaluestringRequireditem_amountobject<money>Optionalcurrency_codestring<currency_code>RequiredvaluestringRequireddiscount_amountobject<money>Optionalcurrency_codestring<currency_code>RequiredvaluestringRequiredadjustment_amountobject<money>Optionalcurrency_codestring<currency_code>RequiredvaluestringRequiredgift_wrap_amountobject<money>Optionalcurrency_codestring<currency_code>RequiredvaluestringRequiredtax_percentagestring<percentage>Optionaltax_amountsobject<item_detail_tax_amount>[]Optionaltax_amountobject<money>Optionalcurrency_codestring<currency_code>RequiredvaluestringRequiredbasic_shipping_amountobject<money>Optionalcurrency_codestring<currency_code>RequiredvaluestringRequiredextra_shipping_amountobject<money>Optionalcurrency_codestring<currency_code>RequiredvaluestringRequiredhandling_amountobject<money>Optionalcurrency_codestring<currency_code>RequiredvaluestringRequiredinsurance_amountobject<money>Optionalcurrency_codestring<currency_code>RequiredvaluestringRequiredtotal_item_amountobject<money>Optionalcurrency_codestring<currency_code>RequiredvaluestringRequiredcheckout_optionsobject<checkout_option>[]Optional