<%@ page import="java.util.*" %> <%@ page import="java.net.*" %> <%@ page import="java.io.*" %> <% // 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); str = str + "&" + paramName + "=" + URLEncoder.encode(paramValue); } // 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. URL u = new URL("https://www.paypal.com/cgi-bin/webscr"); 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(); // assign posted variables to local variables String itemName = request.getParameter("item_name"); String itemNumber = request.getParameter("item_number"); String paymentStatus = request.getParameter("payment_status"); String paymentAmount = request.getParameter("mc_gross"); String paymentCurrency = request.getParameter("mc_currency"); String txnId = request.getParameter("txn_id"); String receiverEmail = request.getParameter("receiver_email"); String payerEmail = request.getParameter("payer_email"); check notification validation if(res.equals("VERIFIED")) { // check that paymentStatus=Completed // check that txnId has not been previously processed // check that receiverEmail is your Primary PayPal email // check that paymentAmount/paymentCurrency are correct // process payment } else if(res.equals("INVALID")) { // log for investigation } else { // error } %>
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