Paypal：IPN監聽器沒有收到IPN消息

我有一個網站，使用貝寶作爲付款選項的在線交易。結賬和貝寶方面的購物車計算工作正常，但我沒有收到來自貝寶沙箱的任何IPN消息。寫完日誌後，我發現參數formdata爲空。即使使用IPN歷史記錄進行檢查，它也會顯示IPN消息的狀態爲正在重試... IPN通知網址也已設置。以下是偵聽器代碼。Paypal：IPN監聽器沒有收到IPN消息

[Route("IPN")] 
    public IHttpActionResult IPN(FormDataCollection formData) 
    { 

     var formVals = new Dictionary<string, string>(); 
     formVals.Add("cmd", "_notify-validate"); 

     string response = GetPayPalResponse(formVals, formData); 

     if (response.ToUpper().Trim() == "VERIFIED") 
     { 

      //entry into database 

      } 
      else 
      { 

       return InternalServerError(); 
      } 

     return InternalServerError(); 
    } 

string GetPayPalResponse(Dictionary<string, string> formVals, FormDataCollection formData) 
    { 

     string paypalUrl = GetPayPalURL(); 
     HttpWebRequest req = (HttpWebRequest)WebRequest.Create(paypalUrl); 

     // Set values for the request back 
     req.Method = "POST"; 
     req.ContentType = "application/x-www-form-urlencoded"; 

     Encoding encoding = Encoding.UTF8; 

     StringBuilder sb = new StringBuilder(); 
     foreach (var entry in formData.ToList()) 
     { 
      sb.AppendFormat("{0}={1}&", entry.Key, encoding.GetString(encoding.GetBytes(entry.Value))); 
     } 

     string strRequest = sb.ToString(); 
     strRequest += "cmd=_notify-validate"; 
     req.ContentLength = strRequest.Length; 

     //Send the request to PayPal and get the response 
     StreamWriter streamOut = new StreamWriter(req.GetRequestStream()); 
     streamOut.Write(strRequest); 
     streamOut.Close(); 

     StreamReader streamIn = new StreamReader(req.GetResponse().GetResponseStream()); 
     string strResponse = streamIn.ReadToEnd(); 
     streamIn.Close(); 

     return strResponse; 
    }

這是工作之前，但不知道什麼阻止了它。作爲Paypal支付網關的新手，任何幫助將不勝感激。

來源

2016-07-26 Suhas Pansare

有沒有人得到這個工作... –