ICalculateProposalTotalRequest

{
    "items": [
        {
            "taxIds": [
                "string"
            ],
            "discountIds": [
                "string"
            ],
            "newAmount": 0,
            "quantity": 0
        }
    ],
    "discountIds": [
        "string"
    ],
    "taxIds": [
        "string"
    ],
    "taxCalculationMode": "before-discount",
    "currency": {
        "name": "string",
        "symbol": "string"
    },
    "taxPerItem": true,
    "discountPerItem": true
}