amount property
The total order amount with an optional breakdown that provides details, such as the total item amount, total tax amount, shipping, handling, insurance, and discounts, if any. If you specify amount.breakdown, the amount equals item_total plus tax_total plus shipping plus handling plus insurance minus shipping_discount minus discount. The amount must be a positive number. For listed of supported currencies and decimal precision, see the PayPal REST APIs Currency Codes.
Implementation
final AmountWithBreakdown amount;