沙盒paypal在线支付成功后返回非法参数invalid

Question

测试的时候，PayPal一直返回invalid，求大神解答
public void ipn() throws IOException, DaoException {
String res ="";
Enumeration en = context.getRequest().getParameterNames();
String str = "cmd=_notify-validate";
while (en.hasMoreElements()) {
String paramName = (String) en.nextElement();
String paramValue = context.getRequest().getParameter(paramName);
str = str + "&" + paramName + "=" + URLEncoder.encode(paramValue);
}
System.out.println(str);

    URL u = new URL("https://www.sandbox.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()));
    res = in.readLine();
    in.close();
    System.out.println(res);
    // assign posted variables to local variables
    String videoId = context.getRequest().getParameter("item_number");
    String paymentAmount = context.getRequest().getParameter("mc_gross");
    String paymentCurrency = context.getRequest().getParameter("mc_currency");
    // 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


        System.out.println("Success");
    } else if (res.equals("INVALID")) {
        // log for investigation
        System.out.println("invalid Fail");
    } else {
        // error
        System.out.println("Nothing");
    }

}

Answer 1

后来发现是PayPal的账户设置不正确