ShippingItem: {
    adjustedTax?: number;
    basePrice?: number;
    itemId?: string;
    itemText?: string;
    price?: number;
    priceAdjustments?: PriceAdjustment[];
    priceAfterItemDiscount?: number;
    shipmentId?: string;
    tax?: number;
    taxBasis?: number;
    taxClassId?: string;
    taxRate?: number;
} & {
    [key: string]: any;
}