发布到 Square 时出现 422 状态代码错误？

Question

请帮我完成这最后一步，这样我就可以完成这个项目了:)

我正在尝试将此示例转换为 Vb.Net:

https://docs.connect.squareup.com/articles/processing-payment-rest/

我可以在用户输入信用卡信息后成功获取到一个CardOnce ID。我可以成功地从 Square 读取以获取我的位置 ID。但是，当我提供 CardOnce ID、位置 ID 并达到 POST 时，我卡在了最后一步，我一直收到错误消息："The remote server returned an error: (422) status code 422."

我的代码如下，错误发生：

调用时出现错误：

response = DirectCast(request.GetResponse(), HttpWebResponse)

完整代码在这里：

Public Function IsSuccessProcess(ByVal sLocationId As String, ByVal sCardOnce As String, ByVal iAmount As Integer)
    Dim request As HttpWebRequest
    Dim response As HttpWebResponse = Nothing
    Dim reader As StreamReader
    Dim address As Uri
    Dim data As StringBuilder
    Dim byteData() As Byte
    Dim postStream As Stream = Nothing

    address = New Uri("https://connect.squareup.com/v2/locations/" & sLocationId & "/transactions")

    ' Create the web request  
    request = DirectCast(WebRequest.Create(address), HttpWebRequest)

    ' Set type to POST  
    request.Method = "POST"
    request.ContentType = "application/json"
    request.Accept = "application/json"
    request.Headers.Add("Authorization", "Bearer " & AccessToken)

    data = New StringBuilder()
    Dim sQuote As String = """"
    sQuote = "'"
    data.Append("{" & sQuote & "card_nonce" & sQuote & ": " & sCardOnce & "," & sQuote & "amount_money" & sQuote & ": {" & sQuote & "amount" & sQuote & ": " & iAmount & "," & sQuote & "currency" & sQuote & ": " & sQuote & "USD" & sQuote & "}")

    Dim didempotency_key As Double = Microsoft.VisualBasic.Timer
    Dim idempotency_key As Integer = CInt(didempotency_key)
    data.Append("'idempotency_key': " & idempotency_key)
    ' Create a byte array of the data we want to send  
    byteData = UTF8Encoding.UTF8.GetBytes(data.ToString())
    ' Set the content length in the request headers  
    request.ContentLength = byteData.Length

    ' Write data  
    Try
        postStream = request.GetRequestStream()
        postStream.Write(byteData, 0, byteData.Length)
    Finally
        If Not postStream Is Nothing Then postStream.Close()
    End Try

    Try
        ' Get response  
        response = DirectCast(request.GetResponse(), HttpWebResponse)

        ' Get the response stream into a reader  
        reader = New StreamReader(response.GetResponseStream())

        ' Console application output  
        Console.WriteLine(reader.ReadToEnd())
    Finally
        If Not response Is Nothing Then response.Close()
    End Try


    Return True

End Function

Answer 1

可能会出现此错误，因为您在 JSON 正文中使用了单引号而不是双引号。第一步尝试替换它们。

请注意，您可能会发现借助 Json.NET.

等第三方库更容易生成和解析 JSON 对象

最后，正如 Troy 所提到的，有用的错误消息会在端点响应正文中返回，这应该有助于您诊断未来的问题。有关详细信息，请参阅 this article。

Answer 2

我一直在研究 JSON 字符串，终于找到了获胜组合。我没有正确使用 "amount_money"。此外，SDK 表示您必须使用 idempotency_key，我在某些试验中没有使用它。最后，您必须使用实际引号，而不是单个撇号：

Dim sKey As String = Guid.NewGuid().ToString()
Dim sMyJsonString As String
sMyJsonString = "{" & sQuote & "card_nonce" & sQuote & ":" & sQuote & sCardOnce & sQuote & "," & sQuote & "amount_money" & sQuote & ": {" & sQuote & "amount" & sQuote & ": " & iAmount & "," & sQuote & "currency" & sQuote & ": " & sQuote & "USD" & sQuote & "}," & sQuote & "idempotency_key" & sQuote & ":" & sQuote & sKey & sQuote & "}"
data.Append(sMyJsonString)

我最终向自己收取了 1.00 美元，该费用显示在我的 Square 帐户中。这比我希望的要花更长的时间才弄清楚，但一切都好，结局好。

发布到 Square 时出现 422 状态代码错误？

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