这是callback.PHP文件失败的地方(存在)：

curl_setopt($ch,CURLOPT_CAINFO,'cacert.pem');
if( !($res = curl_exec($ch)) ) {
    echo ("Got " . curl_error($ch) . " when processing IPN data");
    curl_close($ch);
    exit;
}
curl_close($ch);

出现以下错误消息：

Got error setting certificate verify locations: CAfile: cacert.pem
CApath: none when processing IPN data

所以我下载了cacert.pem并复制到callback.PHP文件所在的目录.

这是上面代码之前的注释：

// 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.

我正在使用XAMPP,这会是问题吗？

最后这是直接来自开发者页面的整个PHP文件：
https://www.x.com/developers/PayPal/documentation-tools/code-sample/216623

<?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

$ch = curl_init('https://www.sandBox.paypal.com/cgi-bin/webscr');
curl_setopt($ch,CURLOPT_HTTP_VERSION,CURL_HTTP_VERSION_1_1);
curl_setopt($ch,CURLOPT_POST,1);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,CURLOPT_POSTFIELDS,$req);
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,CURLOPT_SSL_VERIFYHOST,2);
curl_setopt($ch,CURLOPT_FORBID_REUSE,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($ch,'cacert.pem');
if( !($res = curl_exec($ch)) ) {
    echo ("Got " . curl_error($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'];

    $string = "------------------------\r\n";
    $string .= "item_name: ".$item_name."\r\n";
    $string .= "item_number: ".$item_number."\r\n";
    $string .= "payment_status: ".$payment_status."\r\n";
    $string .= "payment_amount: ".$payment_amount."\r\n";
    $string .= "payment_currency: ".$payment_currency."\r\n";
    $string .= "txn_id: ".$txn_id."\r\n";
    $string .= "receiver_email: ".$receiver_email."\r\n";
    $string .= "payer_email: ".$payer_email."\r\n";

    $fp = fopen('test.log','w');
    fwrite($fp,$string."\r\n");
    fclose($fp);

} else if (strcmp ($res,"INVALID") == 0) {
    // log for manual investigation
}
?>