php - PayPal IPN working on sandbox but not live

Question

I've got this PayPal IPN script, tested it in sandbox mode and it works perfectly but when I use it in live mode it doesn't work. No errors or other. What should I do to fix this issue?

    <?php
define("DEBUG", 0);
define("USE_SANDBOX", 0);
define("LOG_FILE", "./ipn.log");
$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]);
}
$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";
}
if(USE_SANDBOX == true) {
    $paypal_url = "https://www.sandbox.paypal.com/cgi-bin/webscr";
} else {
    $paypal_url = "https://www.paypal.com/cgi-bin/webscr";
}
$ch = curl_init($paypal_url);
if ($ch == FALSE) {
    return FALSE;
}
curl_setopt($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);
if(DEBUG == true) {
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLINFO_HEADER_OUT, 1);
}
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close'));
$cert = __DIR__ . "./cacert.pem";
curl_setopt($ch, CURLOPT_CAINFO, $cert);
$res = curl_exec($ch);
if (curl_errno($ch) != 0)
    {
    if(DEBUG == true) { 
        error_log(date('[Y-m-d H:i e] '). "Can't connect to PayPal to validate IPN message: " . curl_error($ch) . PHP_EOL, 3, LOG_FILE);
    }
    curl_close($ch);
    exit;
} else {
        // Log the entire HTTP response if debug is switched on.
        if(DEBUG == true) {
            error_log(date('[Y-m-d H:i e] '). "HTTP request of validation request:". curl_getinfo($ch, CURLINFO_HEADER_OUT) ." for IPN payload: $req" . PHP_EOL, 3, LOG_FILE);
            error_log(date('[Y-m-d H:i e] '). "HTTP response of validation request: $res" . PHP_EOL, 3, LOG_FILE);
        }
        curl_close($ch);
}
$tokens = explode("\r\n\r\n", trim($res));
$res = trim(end($tokens));
if (strcmp ($res, "VERIFIED") == 0) {

    $receiver_email = $_POST['receiver_email'];
    $payer_email = $_POST['payer_email'];
    $payment_status = $_POST['payment_status'];
        $item_number = $_POST['item_number'];

        if($payment_status == 'Completed') {
        require_once("../assets/includes/core.php");
        require_once("../assets/includes/settings.php");

if(USE_SANDBOX == true) {
        $rec_email = "[email protected]";

} else {
        $rec_email = "[email protected]";
}

        if($receiver_email == $rec_email) {
        $con = mysql_connect($dbhost,$dbuser,$dbpass);
        mysql_select_db('website');

        function generateString($length)
{   
    $charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-";

    for($i=0; $i<$length; $i++) 
        $key .= $charset[(mt_rand(0,(strlen($charset)-1)))]; 

    return $key;
}
$code = generateString("30");

           $insert_code = mysql_query("INSERT INTO `$dbtable_wsc` (`code`,`payer_email`,`item_number`,`used`,`gen_date`) VALUES('$code','$payer_email','$item_number','no', NOW())") or die("MYSQL INSERT CODE QUERY ERROR: " . mysql_error());

        mysql_close($con);
    require("phpmailer/class.phpmailer.php");

    $mail = new PHPMailer();
    $mail->IsSMTP();
    $mail->SMTPAuth = true;
    $mail->Host     = "ssl://smtp.gmail.com";
    $mail->Port     = 465;
    $mail->Username = "[email protected]";
    $mail->Password = "******";
    $mail->FromName = "mydomain";
    $mail->Subject  = "mydomain | Redeem Code";
    $mail->Body     = "
    Your redeem code is ".$code."

    To use your code click here: $root_link/webshop/red.php?code=".$code."&step=step2

    Thank you for have given your support with a donation to mydomain, we really appreciate it!

    mydomain";
    $mail->AddAddress($payer_email);
    if(!$mail->Send()){
        echo "Mailer Error. Contact our Support Team giving them this error: " . $mail->ErrorInfo;
    }

echo "Email sent to $payer_email with the redeem code. If you didn't received your email go <a href='./red.php'>there</a> to redeem you code.";
    } else {
        die("You are trying to pay to the wrong email!");
        }

}
    if(DEBUG == true) {
        error_log(date('[Y-m-d H:i e] '). "Verified IPN: $req ". PHP_EOL, 3, LOG_FILE);
    }
} else if (strcmp ($res, "INVALID") == 0) {
    if(DEBUG == true) {
        error_log(date('[Y-m-d H:i e] '). "Invalid IPN: $req" . PHP_EOL, 3, LOG_FILE);
    }
}
?>

Tested this several times in sandbox mode but each time I set this live and my customers try to buy something all works exept the IPN confirmation so they don't get anything. I also would like some suggestions on how I could make better checks for ensure the payment has not been already processed or is not a fake one. Thanks!

P.S. I'm aware of the mysql extension of php being deprecated but currently that's not my main problem.

Answer 1

Didn't read the code, but I know for me I looked and there was two different ITNs: one for live, and one for sandbox.

Had to set them both

Hope that helps