java - PayPal IPN returns INVALID on live and VERIFIED on sandbox -


i have been trying implement paypal ipn system in our company website. when test script in ipn sandbox tool, validated , goes well, when move live, ipn returned invalid payment has been completed well. when check ipn history in account, can see ipn message http response 200:

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&notify_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 java servlet. dopost action is:

 @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 paypal system , 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 paypal system validate     // note: change http: https: in following url verify using ssl (for increased security).     // using https requires either java 1.4 or greater, or java secure socket extension (jsse)     // , configured 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 la que redirigimos 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 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 response invalid in live mode**     if (res != null && res.equals("verified")) { //res = "verified" res = "invalid"         // more code not important issue....

any idea? said, payments completed ipn sended invalid.

i know old might else, think need post data validation.

according paypal ipn docs:

//after receiving ipn message paypal,  //you must respond paypal post message  //that begins "cmd=_notify-validate". //append message duplicate of  //notification received (the same ipn fields  //and values in exact order received them)  ... url u = new url(url); httpurlconnection uc = (httpurlconnection) u.openconnection(); uc.setrequestmethod("post"); ...

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