// Method Bearer + parameters by Post
$data1 = array(
    'requester_ip' => $_SERVER['REMOTE_ADDR'],   
);

$h = curl_init($introspection_endpoint); 
curl_setopt($h, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/x-www-form-urlencoded', 
    'Authorization: Bearer ' . $res1['id_token']
)); 
curl_setopt($h, CURLOPT_RETURNTRANSFER, true);
curl_setopt($h, CURLOPT_POST, 1);  
curl_setopt($h, CURLOPT_POSTFIELDS, http_build_query($data1));

$res = curl_exec($h);

...