paypal - 是否可以将金额转回我的网站

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转回我的网站或已制作的详细信息在 www.sandbox.paypal.com 中？如果是，你能告诉我一些关于如何做到这一点的例子。

在我尝试订阅按钮后，这是返回的值，我在您提供的链接中找不到某些值。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。

Answer 1

您可以通过以下两种方式之一来执行此操作。付款完成后，您可以使用 IPN 或 PDT 将信息返回到您的站点。两种方法中更好的方法是使用 IPN，或者至少将 IPN 与 PDT 结合使用。

即时付款通知 (IPN)是一种消息服务，可通知您与 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，例如履行订单、跟踪客户以及提供与交易相关的状态和其他信息。

您可以在此处的页面上找到更多关于 IPN 的信息。同样在该页面上，左侧还有一些有用的链接。这里有用于创建侦听器、设置、测试、IPN 历史、带 FMF 的 IPN、IPN/PDT 变量和示例代码的页面。这里还有一些示例代码示例。

PayPal 的 PDT系统向使用 PayPal Payments Standard 的商家网站发送订单确认，并让他们验证此信息。然后，此类站点可以在本地“订单确认”页面中显示此数据。IPN 比 PDT 更可靠，而且使用 PDT，它依赖于买家单击按钮返回您的站点。如果他们没有单击按钮返回您的站点，则不会发回任何信息，并且您无法像使用 IPN 那样重新发送此信息。您可以在此处找到更多关于 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 来更新我的数据库和自动化一些任务。希望这可以帮助。:)

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>