No Result for Reference User

API
2

PHP right?

Don’t use shell exec (it’s a security risk and that is likely your issue as it’s security blocked)

Use cURL naively instead, for example:

$ch = curl_init('https://api.twitch.tv/helix/users?id=' . $userID);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Client-ID: YourClientID'));
$r = curl_exec($ch);
curl_close($ch);
$json_obj  = json_decode($r);