windorm執行API V2 報錯 Status code 500, ReasonPhrase:'Internal Server Error', Version: 1.1, Content: System.Net.Http.StreamContent,

請問我用C#winfrom 執行API V2 下單

透過  HttpResponseMessage 回傳資料卻一直出現Status code 500, ReasonPhrase:'Internal Server Error', Version: 1.1, Content: System.Net.Http.StreamContent,

是甚麼原因?