Payment include an
itemizations field that lists the items purchased,
along with associated fees, modifiers, and discounts.
The type of purchase that the itemization represents, such as an ITEM or CUSTOM_AMOUNT
Details of the item, including its unique identifier and the identifier of the item variation purchased.
Notes entered by the merchant about the item at the time of payment, if any.
The total cost of the item, including all taxes and discounts.
The total cost of the itemization and its modifiers, not including taxes or discounts.
The total of all discounts applied to the itemization. This value is always negative or zero.