在回复PayPal

Question

根据paypal ipn文档，我需要在收到ipn消息后回复paypal。问题是即使我从paypal服务器获得“验证”后，我仍然收到相同的ipn消息。我做了什么有什么不对吗？我正在使用responseBackIpnMessage来响应回ipn消息。而且我总是收到“验证”。

 public void handlePaypalIpnMessage(HttpServletRequest request) {
            Map<String, String> configMap = new HashMap<String, String>();
            IPNMessage message = new IPNMessage(request, configMap);
            boolean isIpnVerified = responseBackIpnMessage(request);
            Map<String, String> map = message.getIpnMap();
            ......
        }

private boolean responseBackIpnMessage(HttpServletRequest request) {
    HttpClient httpClient = new DefaultHttpClient();  
    HttpParams clientParams = httpClient.getParams();
    HttpConnectionParams.setConnectionTimeout(clientParams, 40000);
    HttpConnectionParams.setSoTimeout(clientParams, 40000);

    HttpPost httppost = new HttpPost(paypalIpnUrl); // https://www.paypal.com/cgi-bin/webscr
    httppost.setHeader("Content-Type", "application/x-www-form-urlencoded");

    try {
        Map<String, String> params = new HashMap<String, String>();
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
        nameValuePairs.add(new BasicNameValuePair("cmd", "_notify-validate"));
        Enumeration<String> names = request.getParameterNames();
        while (names.hasMoreElements()) {
            String param = names.nextElement();
            String value = request.getParameter(param);
            nameValuePairs.add(new BasicNameValuePair(param, value));
            params.put(param, value);
        }
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        if (!verifyIpnResponse(httpClient.execute(httppost))) {
            logger.error("Previous message is invalid according to paypal server.");
            return false;
        } else {
            logger.info("Previous message is verified by paypal server");
            return true;
        }
    } catch ( UnsupportedEncodingException e ) {            
        e.printStackTrace();
    } catch ( ClientProtocolException e ) {
        e.printStackTrace();
    } catch ( IOException e ) {
        e.printStackTrace();
    }
    return true;    
}

private boolean verifyIpnResponse(HttpResponse response) throws IllegalStateException, IOException {
    InputStream is = response.getEntity().getContent();
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    String responseText = reader.readLine();
    is.close();
    logger.debug("Paypal server ipn response: " + responseText);
    return responseText.equals("VERIFIED");
}

Answer 1

如果您获得重复的IPN，这意味着您的脚本以某种方式失败，并且没有将200 OK响应返回给PayPal的服务器。

验证过程实际上与此无关。这简单地验证了来自PayPal的数据。它没有验证脚本是否成功完成。

如果您按照how to test PayPal IPN中本指南中的步骤操作，则应该能够找到问题。