Paypal PDT curl returns false?

Question

PHP

I get tx from the stick, then I send my token and this tx. But in response I get nothing $status = 0, here is the code

$tx = $_GET['tx'];
$auth_token = "I_o-o3auPvfXBbZ49cZpMQP1PXxvhbjkKB1vi0tgMFRv0e8ucdThFIqnRvS";
$request = curl_init();
// Set request options
curl_setopt_array($request, array
(
  CURLOPT_URL => 'https://www.sandbox.paypal.com/cgi-bin/webscr',
  CURLOPT_POST => TRUE,
  CURLOPT_POSTFIELDS => http_build_query(array
    (
      'cmd' => '_notify-synch',
      'tx' => $tx,
      'at' => $auth_token,
    )),
  CURLOPT_RETURNTRANSFER => TRUE,
  CURLOPT_HEADER => FALSE,
  CURLOPT_SSL_VERIFYHOST => 6,
  CURLOPT_SSL_VERIFYPEER => true,
  CURLOPT_CAINFO => 'cacert.pem',
  
));

// Execute request and get response and status code
$response = curl_exec($request);
$status   = curl_getinfo($request, CURLINFO_HTTP_CODE);

The advice that is given on stackoverflow already tried nothing helped, so it is advisable to answer those who have come across this topic.

Answer 1

I would look not at CURLINFO_HTTP_CODE, but at CURLINFO_SSL_VERIFYRESULT first.
And CURLOPT_SSL_VERIFYHOST is not clear where you got 6 from.

Answer 2

use wget to make this request manually