如何通过 IPN 使用 paypal 订阅以及如何知道是否有人取消

Question

我正在尝试在每月向用户收费的网站上创建订阅。当他们付款时，我数据库中的数据列从 0 变为 1。如果他们取消，同一列将变回 0。

我已经创建了一个购买按钮来执行此操作，一旦他们购买，它会将列更改为 1。我需要添加什么来使用订阅按钮，如果他们取消将其更改回 0？

这是我的代码：这会创建订阅按钮吗？我用在 paypal 上找到的订阅按钮修改了我的购买按钮。

  <form name="_xclick" action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_xclick-subscriptions">
<input type="hidden" name="business" value="cccc@msn.com">
<input type="hidden" name="item_name" value="$info">
<input type="hidden" name="a3" value="5.00">
<input type="hidden" name="p3" value="1">
<input type="hidden" name="t3" value="M">
<input type="hidden" name="src" value="1">
<input type="hidden" name="sra" value="1">
<input type="hidden" name="no_shipping" value="1">
<input type="hidden" name="no_note" value="1">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="lc" value="GB">
<input type="hidden" name="return" value="http://ccccc.com/application.php">
<input type="hidden" name="cancel_return" value="http://www.ccccc.com/index.php">
<input type="hidden" name="rm" value="2">
<input type="hidden" name="notify_url" value="http://www.ccccc.com/ipn.php">
<input type="hidden" name="custom" value="$uid">
<input type="image" src="http://www.paypal.com/en_US/i/btn/btn_subscribe_LG.gif" border="0" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
</form>

这里是我的 IPN 代码：我是否需要添加到此处以使其与订阅一起使用，如果他们取消将其更改回 0。是否有一个变量在用户被取消时发送或者我需要创建一个新文件来处理已取消的帐户？

$connection = mysql_connect("localhost","theelit9_chris","");
mysql_select_db("theelit9_date",$connection);



// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';

foreach ($_POST as $key => $value) {
$value = urlencode(stripslashes($value));
$req .= "&$key=$value";
}

// post back to PayPal system to validate
$header .= "POST /cgi-bin/webscr HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);

// 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'];
$user_id = mysql_real_escape_string((int)$_POST["custom"]);

if (!$fp) {
// HTTP ERROR
} else {
fputs ($fp, $header . $req);
while (!feof($fp)) {
$res = fgets ($fp, 1024);
if (strcmp ($res, "VERIFIED") == 0) {

    if ($payment_status == 'Completed') {

        $txn_id_check = "SELECT `txn_id` FROM `log` WHERE `txn_id` = '".$txn_id."'";
        $result = mysql_query($txn_id_check);
        if (mysql_num_rows($result) !=1 ) {

            if ($receiver_email=='xxxx@msn.com') {

                if ($payment_amount == '0.01' && $payment_currency == 'USD') {

                    $log_query = "INSERT INTO `log` VALUES ('','".$txn_id."','".$payer_email."')";

                     $update_user_level = "UPDATE `users` SET `user_level` = '2', WHERE `id`='".$user_id."'";



            mysql_select_db("theelit9_date",$connection);
            $retval = mysql_query( $log_query, $connection );
            $retval1 = mysql_query( $update_user_level, $connection );
            if(! $retval && !$retval1)
                {
                die('Could not enter data: ' . mysql_error());
                }
                    }

                }

            }

        }

}

else if (strcmp ($res, "INVALID") == 0) {
// log for manual investigation
}
}
fclose ($fp);
}

Answer 1

当买家取消订阅时，PayPal 会向您发送一个带有 txn_type=subscr_cancel 或 txn_type=recurring_payment_profile_cancel 的 IPN（取决于创建的订阅的确切类型）。然后您可以查看subscr_id 或recurring_payment_id 参数来确定刚刚取消的订阅的订阅ID。