将phpmailer_v5.1 use_gmail与paypal ipn responder结合使用

第一个脚本：
这是Paypal ipn响应者(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

$ch = curl_init('https://www.paypal.com/cgi-bin/webscr');
curl_setopt($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,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
}
?>

第二个脚本：

这是phpmailer_v5.1 use_gmail.php：

<?php
// example on using PHPMailer with GMAIL

include("class.phpmailer.php");
include("class.smtp.php"); // note,this is optional - gets called from main class if not already loaded

$mail             = new PHPMailer();
$body             = 'this is the body of the email';

$mail->IsSMTP();
$mail->SMTPAuth   = true;                  // enable SMTP authentication
$mail->SMTPSecure = "ssl";                 // sets the prefix to the servier
$mail->Host       = "smtp.gmail.com";      // sets GMAIL as the SMTP server
$mail->Port       = 465;                   // set the SMTP port

$mail->Username   = "yourname@gmail.com";  // GMAIL username
$mail->Password   = "password";            // GMAIL password

$mail->From       = "replyto@yourdomain.com";
$mail->FromName   = "Webmaster";
$mail->Subject    = "This is the subject";
$mail->AltBody    = "This is the body when user views in plain text format"; //Text Body
$mail->WordWrap   = 50; // set word wrap

$mail->MsgHTML($body);
$mail->AddReplyTo("replyto@yourdomain.com","Webmaster");
$mail->AddAttachment("/path/to/file.zip");             // attachment
$mail->AddAttachment("/path/to/image.jpg","new.jpg"); // attachment
$mail->AddAddress("username@domain.com","First Last"); //here I need stackoverflow-help
$mail->IsHTML(true); // send as HTML

if(!$mail->Send()) {
    echo "Mailer Error: " . $mail->ErrorInfo;
} else {
    echo "Message has been sent";
}
?>

我在同一个文件夹中有class.smtp和class.phpmailer.use_gmail.php经过测试,正在运行并发送电子邮件.但是,当我在此行中写入目标电子邮件地址时：

$mail->AddAddress("username@domain.com","First Last");

我想将电子邮件发送给刚付款的客户.如何从Paypal获取目的地电子邮件地址？