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I was trying to use the project ShippingTesting in Visual Studio(C#). I tried UPS which works great.
But when I tried FeDex, it threw an error saying:

"Newtonsoft.Json.JsonSerializationException", " Additional information: Error converting value "PRE_TRANSIT" to type 'Shippo.ShippoEnums+TrackingStatus'. Path 'tracking_history[0].status',"

It looks like a JSON serialization issue. Will this be a constant issue with Fedex?
Thanks!

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在最新版本的 API 中添加了“PRE_TRANSIT”作为可能的状态（当标签已创建但尚未进入传输时，它会替换旧的初始“未知”状态）。

可能需要更新 C# 库以支持此附加映射。作为一种解决方法，您可以在请求的标头中传递较旧的 API 版本（“2018-02-08”之前），这应该返回旧的“未知”映射。

参考：https ://goshippo.com/docs/changelog

于 2018-05-21T18:48:16.717 回答