PayPal keep getting invalid ipn

Question

Here's my IPN handler:

<?php
include 'constants.php';
include 'classes/class.database.php';

$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'));

$res = curl_exec($ch);

if (curl_errno($ch) != 0) // cURL error
    {
    if(DEBUG == true) { 
        error_log(date('[Y-m-d H:i e] '). "Can't connect to PayPal to validate IPN message: " . curl_error($ch) . PHP_EOL, 3, LOG_FILE);
    }
    curl_close($ch);
    exit;
} else {
    if(DEBUG == true) {
        error_log(date('[Y-m-d H:i e] '). "HTTP request of validation request:". curl_getinfo($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) {
    $status = $_POST['payment_status'];
    $currency = $_POST['mc_currency'];
    $receiver = $_POST['receiver_email'];
    $buyer = $_POST['payer_email'];
    $buyer_name = $_POST['custom'];

    $db = new Database($sql_host, $sql_user, $sql_pass, $sql_data, "payments");
    $db->connect();

    for ($i = 0; $i < 10; $i++) {
        if (isset($_POST['item_name'.$i])) {
            $db->addPayment($_POST['item_name'.$i], $_POST['item_number'.$i], $status, $_POST['mc_gross_'.$i], $currency, $buyer, $receiver, $buyer_name);
        }
    }

    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);
    }
}?>

And here's what the IPN's returning:

INVALID
[2016-02-28 05:55 UTC] Invalid IPN: cmd=_notify-validate&mc_gross=0.01&protection_eligibility=Eligible&address_status=confirmed&item_number1=36&payer_id=7GXJG3SBPYHEY&tax=0.00&address_street=&payment_date=21%3A55%3A22+Feb+27%2C+2016+PST&payment_status=Completed&charset=UTF-8&address_zip=&mc_shipping=0.00&mc_handling=0.00&first_name=&mc_fee=0.01&address_country_code=GB&address_name=&notify_version=3.8&custom=Alex&payer_status=verified&business=&address_country=United+Kingdom&num_cart_items=1&mc_handling1=0.00&address_city=&verify_sign=AzEkqtmA1WmF4x7TDnCOWp34hPjAASvAQSuGR4.BNB0U46x2nInwBmEo&payer_email=&mc_shipping1=0.00&tax1=0.00&txn_id=50446034DM994872C&payment_type=instant&payer_business_name=&last_name=&address_state=&item_name1=test+%28do+not+buy%29&receiver_email=***&payment_fee=0.01&quantity1=1&receiver_id=RJ5DJ76VDC7RC&txn_type=cart&mc_gross_1=0.01&mc_currency=USD&residence_country=GB&transaction_subject=&payment_gross=0.01&ipn_track_id=487a9f43c92

any help would be great.

Answer 1

You need to be in test mode for IPN Simulator to work.

Make sure to set define("USE_SANDBOX", 1);. Then you should be fine

Answer 2

It looks like you didn't post back IPN message to https://www.paypal.com/cgi-bin/webscr , in this case, you need to check your IPN script related log, maybe there are some error message that can indicates some connection issue, then you can fix the issue accordingly.