当买方支付订阅费用时，notify_url 从不调用

If your script has a syntax or logic error in it, odds are you will not see the correct result. An easy way to test your script is by sending a "dummy" post to the script and writing some code to "do something" if the response from PayPal is INVALID. Essentially, if you copy the code that you want to fire when the response from PayPal is VERIFIED to the part of the script that runs if the response is INVALID, you can send a dummy post to the script to see if your code works. Since a dummy post to the script will return INVALID (since the post was not originated from PayPal), this is why you want to add the code to the 'if INVALID' part of your script.

• 发布到您的返回 URL(返回方法)

某些商家的设置是，他们希望将 IPN 数据发布到其按钮代码(返回)中返回变量的值中.这是在进行 PayPal 付款后买家被定向到的 URL.要将 IPN 数据发布到您的返回 URL，您必须在按钮代码中将 rm 变量设置为等于2"，否则您可能看不到任何 IPN 数据发布到您的返回 URL.有关更多信息，请参阅此帖子.** 请注意，此信息是关于可以通过返回传递的 IPN 数据以及它如何与您的返回 URL(按钮代码变量返回")一起使用.如果您启用了 PDT 的自动返回，则此信息不适用于您，因为 PDT 是其自己的独立功能.可在此处找到有关 PDT 的更多信息.

$header = "POST /cgi-bin/webscr HTTP/1.1
";
$header .= "Host: www.paypal.com
";
$header .= "Content-Type: application/x-www-form-urlencoded
";
$header .= "Content-Length: " . strlen($req) . "
";
$header .= "Connection: Close

";
$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);

$url= 'https://www.sandbox.paypal.com/cgi-bin/webscr';

$curl_result=$curl_err='';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/x-www-form-urlencoded", "Content-Length: " . strlen($req)));
curl_setopt($ch, CURLOPT_HEADER , 0);   
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
$res = @curl_exec($ch);
$curl_err = curl_error($ch);
curl_close($ch);

<form target="_new" method="post" action="https://www.YourDomain.com/Path/IPNhandler.php">
<input type="hidden"  name="SomePayPalVar" value="SomeValue1"/>
<input type="hidden"  name="SomeOtherPPVar" value="SomeValue2"/>

Than etc for all  other variables you want to test with.

</br>
<input  type="submit"/>
</form>