是否有可能通过金额回到我的网站

Question

我是developer.paypal.com的新手，我正在www.sandbox.paypal.com中创建一个订阅按钮，是否可以将客户为订阅支付的金额传递回我的网站或已在www.sandbox.paypal.com中制作的详细信息?如果是，你能向我展示一些关于如何做到这一点的例子吗?

在我尝试订阅按钮后，这是返回的值，我无法在您提供的链接中找到一些值。或者订阅变量如何显示它们?

我无法获得订阅的开始日期和结束日期谢谢你。

Answer 1

有两种方法。您可以使用IPN或PDT在付款完成后将信息返回到您的站点。两种方法中较好的是使用IPN，或者至少将IPN与PDT结合使用。

即时支付通知(IPN)是一个消息服务，通知您与PayPal交易相关的事件。您可以使用它来自动化后台和管理功能，例如完成订单、跟踪客户、提供与交易相关的状态和其他信息。

你可以在这里找到更多的IPN页面。同样在那个页面上，在左手边还有一些有用的链接。这里有创建侦听器、设置、测试、IPN历史记录、带FMF的IPN、IPN/PDT变量和示例代码的页面。这里也有更多的示例代码示例。

PayPal的PDT系统将订单确认发送到使用PayPal支付标准的商家网站，并让他们验证这些信息。这样的网站就可以在本地的"订单确认"页面中显示这些数据。IPN比PDT更可靠，而且PDT依赖于买家点击按钮返回到您的站点。如果他们不点击按钮返回到您的网站，没有信息被发送回来，你不能重新发送这些信息，就像你可以与IPN。你可以在这里找到更多关于PDT的信息。

我个人只使用PDT在我的网站上创建一个动态的感谢页面，并使用IPN更新我的数据库和自动化一些任务。希望这对你有所帮助。:)

示例PHP (v5.2) IPN脚本

<?php
// STEP 1: Read POST data
// reading posted data from directly from $_POST causes serialization 
// issues with array data in POST
// reading raw POST data from input stream instead. 
$raw_post_data = file_get_contents('php://input');
$raw_post_array = explode('&', $raw_post_data);
$myPost = array();
foreach ($raw_post_array as $keyval) {
  $keyval = explode ('=', $keyval);
  if (count($keyval) == 2)
     $myPost[$keyval[0]] = urldecode($keyval[1]);
}
// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';
if(function_exists('get_magic_quotes_gpc')) {
   $get_magic_quotes_exists = true;
} 
foreach ($myPost as $key => $value) {        
   if($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1) { 
        $value = urlencode(stripslashes($value)); 
   } else {
        $value = urlencode($value);
   }
   $req .= "&$key=$value";
}

// STEP 2: Post IPN data back to paypal to validate
$ch = curl_init('https://www.paypal.com/cgi-bin/webscr');
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close'));
// In wamp like environments that do not come bundled with root authority certificates,
// please download 'cacert.pem' from "http://curl.haxx.se/docs/caextract.html" and set the directory path 
// of the certificate as shown below.
// curl_setopt($ch, CURLOPT_CAINFO, dirname(__FILE__) . '/cacert.pem');
if( !($res = curl_exec($ch)) ) {
    // error_log("Got " . curl_error($ch) . " when processing IPN data");
    curl_close($ch);
    exit;
}
curl_close($ch);

// STEP 3: Inspect IPN validation result and act accordingly
if (strcmp ($res, "VERIFIED") == 0) {
    // check whether the payment_status is Completed
    // check that txn_id has not been previously processed
    // check that receiver_email is your Primary PayPal email
    // check that payment_amount/payment_currency are correct
    // process payment
    // assign posted variables to local variables
    $item_name = $_POST['item_name'];
    $item_number = $_POST['item_number'];
    $payment_status = $_POST['payment_status'];
    $payment_amount = $_POST['mc_gross'];
    $payment_currency = $_POST['mc_currency'];
    $txn_id = $_POST['txn_id'];
    $receiver_email = $_POST['receiver_email'];
    $payer_email = $_POST['payer_email'];
} else if (strcmp ($res, "INVALID") == 0) {
    // log for manual investigation
}
?>

示例PDT PHP (v5.3)脚本

<?php
$pp_hostname = "www.paypal.com"; // Change to www.sandbox.paypal.com to test against sandbox

// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-synch';
$tx_token = $_GET['tx'];
$auth_token = "GX_sTf5bW3wxRfFEbgofs88nQxvMQ7nsI8m21rzNESnl_79ccFTWj2aPgQ0";
$req .= "&tx=$tx_token&at=$auth_token";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://$pp_hostname/cgi-bin/webscr");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
//set cacert.pem verisign certificate path in curl using 'CURLOPT_CAINFO' field here,
//if your server does not bundled with default verisign certificates.
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Host: $pp_hostname"));
$res = curl_exec($ch);
curl_close($ch);
if(!$res){
    //HTTP ERROR
}else{
     // parse the data
    $lines = explode("n", $res);
    $keyarray = array();
    if (strcmp ($lines[0], "SUCCESS") == 0) {
        for ($i=1; $i<count($lines);$i++){
        list($key,$val) = explode("=", $lines[$i]);
        $keyarray[urldecode($key)] = urldecode($val);
    }
    // check the payment_status is Completed
    // check that txn_id has not been previously processed
    // check that receiver_email is your Primary PayPal email
    // check that payment_amount/payment_currency are correct
    // process payment
    $firstname = $keyarray['first_name'];
    $lastname = $keyarray['last_name'];
    $itemname = $keyarray['item_name'];
    $amount = $keyarray['payment_gross'];
    echo ("<p><h3>Thank you for your purchase!</h3></p>");
    echo ("<b>Payment Details</b><br>n");
    echo ("<li>Name: $firstname $lastname</li>n");
    echo ("<li>Item: $itemname</li>n");
    echo ("<li>Amount: $amount</li>n");
    echo ("");
    }
    else if (strcmp ($lines[0], "FAIL") == 0) {
        // log for manual investigation
    }
}
?>

Your transaction has been completed, and a receipt for your purchase has been emailed to you.<br> You may log into your account at <a href='https://www.paypal.com'>www.paypal.com</a> to view details of this transaction.<br>