Access Denied Renspose with PayPal IPN in PHP - php

Question

I am programming a PHP Script to validate IPN PayPal with PHP but in the response I am receiving this:
The response from IPN was:
Access Denied.
You don't have permission to access "/cgi-bin/webscr" on this server.
Actually I am in Sandbox mode and when I go to the IPN Simulator, the answer is successfull but in my PHP Code, the answer enters in the last else, Its like the response is not VERIFIED. Please help me.
This is the code of my PHP Listener:
$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 IPN message sent from PayPal and prepend 'cmd=_notify-validate'
$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
//Operacion: https://ipnpb.paypal.com/cgi-bin/webscr
//Sandbox: https://ipnpb.sandbox.paypal.com/cgi-bin/webscr
$ch = curl_init('https://ipnpb.sandbox.paypal.com/cgi-bin/webscr');
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,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);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close'));
// In wamp-like environments that do not come bundled with root authority certificates,
// please download 'cacert.pem' from "https://curl.haxx.se/docs/caextract.html" and set
// the directory path of the certificate as shown below:
// curl_setopt($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($ch);
// inspect IPN validation result and act accordingly
if (strcmp ($res, "VERIFIED") == 0) {
// The IPN is verified, process it:
// 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 the notification
// 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'];
$header = "From: info#monery.com\nReply-To:".$payer_email."\n";
$mensaje = "Se recibio " . $item_name . ", status fue: " . $payment_status . ", el recibidor fue: " . $receiver_email . ", el pagador fue: " . $payer_email . ". Se cobro $" . $payment_amount;
mail('monery20#gmail.com',$item_name, $mensaje, $header);
// IPN message values depend upon the type of notification sent.
// To loop through the &_POST array and print the NV pairs to the screen:
foreach($_POST as $key => $value) {
echo $key . " = " . $value . "<br>";
}
} else{
// IPN invalid, log for manual investigation
$payer = 'monery20#gmail.com';
$item_name = 'Ha fallado';
echo "The response from IPN was: <b>" .$res ."</b>";
$header = "From: info#monery.com\nReply-To:".$payer."\n";
$mensaje = "Fue invalido, recibiste " . $res;
mail('monery20#gmail.com',$item_name, $mensaje, $header);
} ```

Answer 1

Thank you for your responses actually I solved it. I change the CURLOPT_HTTPHEADER with this:
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close', 'User-Agent: company-name'));
Thank you!