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PayPal IPN returns INVALID in real time and TESTED in the sandbox

I am trying to implement PayPal IPN on our website. When I test my script in the IPN sandbox tool, it is checked and everything goes well, however, when I move it live, the IPN returns as INVALID, but the payment completed well. When I check the IPN history in my account, I see this IPN message with an HTTP 200 response:

mc_gross=0.01&invoice=40&protection_eligibility=Ineligible&item_number1=&payer_id=mypayerId&tax=0.00&payment_date=08:06:52 Sep 03, 2013 PDT&payment_status=Completed&charset=windows-1252&mc_shipping=0.00&mc_handling=0.00&first_name=myName&mc_fee=0.01¬ify_version=3.7&custom=18528&payer_status=verified&business=bussiness_mail&num_cart_items=1&mc_handling1=0.00&verify_sign=AJ.HL1f2A9aoBiFQCLn.3J-QkKQGAF.RVW8er5rbGJ6SsQFWBbStuRtD&payer_email=myMail&mc_shipping1=0.00&tax1=0.00&txn_id=61052338B4613440H&payment_type=instant&last_name=MySurname&item_name1=Paquete Lite&receiver_email=mybussiness_mail&payment_fee=&quantity1=1&receiver_id=SVRXVCZYE2AYC&txn_type=cart&mc_gross_1=0.01&mc_currency=EUR&residence_country=ES&transaction_subject=18528&payment_gross=&ipn_track_id=38c492cbe6257

My IPNHandler is a Java servlet. DoPost action:

  @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Java JSP log.error("IPN doPost " + new Date().getHours() + ":" + new Date().getMinutes() + ":" + new Date().getSeconds()); // read post from PayPal system and add 'cmd' Enumeration en = request.getParameterNames(); String str = "cmd=_notify-validate"; while (en.hasMoreElements()) { String paramName = (String) en.nextElement(); String paramValue = request.getParameter(paramName); paramValue = new String(paramValue.getBytes("iso-8859-1"), "utf-8"); str = str + "&" + paramName + "=" + URLEncoder.encode(paramValue); } boolean isSandbox = "true".equals(PropertiesManager.getProperty("signbox", "PaypalSandbox")); // post back to PayPal system to validate // NOTE: change http: to https: in the following URL to verify using SSL (for increased security). // using HTTPS requires either Java 1.4 or greater, or Java Secure Socket Extension (JSSE) // and configured for older versions. String url = null; if (isSandbox){ url = "https://www.sandbox.paypal.com/cgi-bin/webscr"; }else{ url = "https://www.paypal.com/cgi-bin/webscr"; } log.error("La url de a la que redirigimos a Paypal es " + url); URL u = new URL(url); URLConnection uc = u.openConnection(); uc.setDoOutput(true); uc.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); PrintWriter pw = new PrintWriter(uc.getOutputStream()); pw.println(str); pw.close(); BufferedReader in = new BufferedReader( new InputStreamReader(uc.getInputStream())); String res = in.readLine(); in.close(); log.error("Tras abrir la conexión, res es = " + res); // assign posted variables to local variables String idUser = request.getParameter("custom"); String idCompra = request.getParameter("invoice"); String paymentStatus = request.getParameter("payment_status"); String paymentAmount = request.getParameter("mc_gross"); String fee = request.getParameter("mc_fee"); String paymentCurrency = request.getParameter("mc_currency"); String txnId = request.getParameter("txn_id"); String receiptId = request.getParameter("receipt_id"); String receiverEmail = request.getParameter("receiver_email"); String payerEmail = request.getParameter("payer_email"); String paymentType = request.getParameter("payment_type"); String txnType = request.getParameter("txn_type"); if (!"instant".equals(paymentType) || !"cart".equals(txnType)) { log.debug("NO ES UN CART CHECKOUT. Detalles:"); log.debug("idCompra=" + idCompra); log.debug("status=" + paymentStatus); log.debug("amount=" + paymentAmount); log.debug("currency=" + paymentCurrency); log.debug("transactionId=" + txnId); log.debug("receiptId=" + receiptId); log.debug("receiverEmail=" + receiverEmail); log.debug("payerEmail=" + payerEmail); log.debug("paymentType=" + paymentType); log.debug("txnType=" + txnType); return; } **//HERE THE RESPONSE IS INVALID IN LIVE MODE** if (res != null && res.equals("VERIFIED")) { //res = "VERIFIED" res = "INVALID" // more code not important for this issue....

Any idea? As I said, payments are completed, but the IPN is changed to INVALID.

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2 answers

I know this is old, but it may help someone else, I think you need to execute the POST data to check.

According to Paypal IPN Docs :

 //After receiving an IPN message from PayPal, //you must respond to PayPal with a POST message //that begins with "cmd=_notify-validate". //Append to your message a duplicate of the //notification received (the same IPN fields //and values in the exact order you received them) ... URL u = new URL(url); HttpURLConnection uc = (HttpURLConnection) u.openConnection(); uc.setRequestMethod("POST"); ...
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To receive IPN message data from PayPal, your listener must follow this response stream:

1. Your listener listens for HTTPS POST IPN messages that PayPal sends with each event.

2.After receiving the IPN message from PayPal, your listener returns an empty HTTP 200 response to PayPal. Otherwise, PayPal sends an IPN message.

3. Your listener sends the full message back to PayPal using HTTPS POST.

The return message prefix to the cmd = _notify-validate variable, but do not change the message fields, field order, or character encoding from the original message.

Send response messages back to PayPal:

for more information see also: https://developer.paypal.com/docs/classic/ipn/integration-guide/IPNImplementation/#specs

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Source: https://habr.com/ru/post/1500332/

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