Summary item in a payment request—for example, total, tax, discount, or grand total.
https://developer.apple.com/documentation/passkit/pkpaymentrequest/1619231-paymentsummaryitems
Summary item’s amount.
The amount’s currency is specified at the payment level by setting a value for the currencyCode property on the request.
Short, localized description of the item.
Optional
Type that indicates whether the amount is final.
Summary item in a payment request—for example, total, tax, discount, or grand total.
See
https://developer.apple.com/documentation/passkit/pkpaymentrequest/1619231-paymentsummaryitems