使用Amazon SP-API确认发货时无法设置「配送服务」字段的问题

我在使用亚马逊SP-API时，通过以下代码设置订单追踪号：

public bool UpdateTrackingNumber(DtoShipment dto)
{
    ConfirmShipmentOrderItemsList orderItems = new ConfirmShipmentOrderItemsList();
    foreach (OrderItem item in dto.LstOrderItem)
    {
        orderItems.Add(new ConfirmShipmentOrderItem(item.OrderItemId, item.Quantity));
    }
    ConfirmShipmentRequest confirmShipmentRequest = new ConfirmShipmentRequest()
    {
        MarketplaceId = getMarketPlaceId(dto.CountryCode),
        PackageDetail = new PackageDetail()
        {
            TrackingNumber = dto.TrackingNumber,
            CarrierName = dto.CarrierName,  // "DPD Home 0-31.5kg"
            CarrierCode = dto.CarrierCode,  // "DPD"
            PackageReferenceId = "1",
            ShipDate = DateTime.UtcNow,
            OrderItems = orderItems
        }
    };
    AmazonConnection _connAmazon = createAmazonConnection("marketplaceId");
    return _connAmazon.Orders.ConfirmShipment(dto.AmazonOrderId, confirmShipmentRequest);
}

这段代码能成功设置追踪号，但订单的「配送服务」字段始终为空。想确认是否可以通过这个ConfirmShipment方法同时设置该字段？

补充说明 #

• 编辑1：手动在亚马逊后台设置追踪号时，「承运人」会自动选中"DPD"，「配送服务」自动选中「其他」，下方显示"DPD Home 0-31.5kg"。
• 编辑2：通过API设置时，追踪号和承运人已正常设置，但「配送服务」字段仍为空。而手动操作只需输入追踪号并确认发货，所有相关字段都会自动填充。
• 编辑3：感谢@Charlieface的建议，修改代码后问题解决，调整后的PackageDetail代码如下：

PackageDetail = new PackageDetail()
{
    TrackingNumber = dto.TrackingNumber,
    CarrierName = "",
    CarrierCode = dto.CarrierCode,  // "DPD"
    PackageReferenceId = "1",
    ShipDate = DateTime.UtcNow,
    OrderItems = orderItems,
    ShippingMethod = dto.CarrierName  // "DPD Home 0-31.5kg"
}

内容的提问来源于stack exchange，提问作者Muzaffer Galata