| itemsSubtotal required | number or null <double> The sum of the items' costs without any taxes, fees or discounts. |
| subtotalCost | number or null <double> The total cost of the invoice before invoice-level taxes, fees or discounts. |
| totalCost required | number <double> The total cost of the invoice after invoice-level taxes, fees or discounts. |
{- "itemsSubtotal": 0,
- "subtotalCost": 0,
- "totalCost": 0
}