我已经设置了一个 PDT 表单，它正在工作并收集付款，然后使用以下参数返回到适当的 url
tx=1* * *** *X&st=已完成&amt=0.02&cc=GBP&cm=&item_number=NA
我正在使用以下示例代码：
Dim strSandbox As String = "https://www.sandbox.paypal.com/cgi-bin/webscr"
Dim strLive As String = "https://www.paypal.com/cgi-bin/webscr"
Dim req As HttpWebRequest = CType(WebRequest.Create(strLive), HttpWebRequest)
'Set values for the request back
req.Method = "POST"
req.ContentType = "application/x-www-form-urlencoded"
Dim Param() As Byte = Request.BinaryRead(HttpContext.Current.Request.ContentLength)
Dim strRequest As String = Encoding.ASCII.GetString(Param)
strRequest = strRequest & "&cmd=_notify-validate"
req.ContentLength = strRequest.Length
'for proxy
'Dim proxy As New WebProxy(New System.Uri("http://url:port#"))
'req.Proxy = proxy
'Send the request to PayPal and get the response
Dim streamOut As StreamWriter = New StreamWriter(req.GetRequestStream(), Encoding.ASCII)
streamOut.Write(strRequest)
streamOut.Close()
Dim streamIn As StreamReader = New StreamReader(req.GetResponse().GetResponseStream())
Dim strResponse As String = streamIn.ReadToEnd()
streamIn.Close()
If strResponse = "VERIFIED" Then
'check the payment_status is Completed
'check that txn_id has not been previously processed
'check that receiver_email is your Primary PayPal email
'check that payment_amount/payment_currency are correct
'process payment
lit1.Text = "verified"
ElseIf strResponse = "INVALID" Then
'log for manual investigation
lit1.Text = "invalid"
Else
'Response wasn't VERIFIED or INVALID, log for manual investigation
lit1.Text = "unknown"
End If
lit1.Text = lit1.Text & "<br /><br />" & strRequest.ToString
我只收到无效响应，所以我试图查看发送到 Paypal 的内容，但它只发送 &cmd=_notify-validate 而不是其余参数。
所以我手动添加了参数，但仍然无效。
有人可以帮忙解决我所缺少的吗？支付成功
谢谢