return is null (registered_domain)

Hello
I want to check the license and coordinate with the address of the requesting site
Please check the following code
The “registered_domain” or “item_reference” tag is returned empty.
Please correct.
// ————-file: License.php —————– //

<?php
function License_clicked($postURL, $secretKey, $license_key) {
	// prepare the data
	$data = array ();
	$data['slm_action'] = 'slm_check';
	$data['secret_key'] = $secretKey;
	$data['license_key'] = $license_key;
	// send data to API post URL
	$ch = curl_init ($postURL);
	curl_setopt ($ch, CURLOPT_POST, true);
	curl_setopt ($ch, CURLOPT_POSTFIELDS, $data);
	curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
	$returnValue = curl_exec ($ch);
	// Process the return values
	var_dump($returnValue);
	$obj = json_decode($returnValue);

    $out['status'] = $status= ($obj->{'status'});
	$out['email'] = $status= ($obj->{'email'});
	$out['max_allowed_domains'] = $status= ($obj->{'max_allowed_domains'});
        $out ['registered_domain'] = $status= ($obj->{'registered_domain'});
	$out['item_reference'] = $status= ($obj->{'item_reference'});
	$out['date_created'] = $status= ($obj->{'date_created'});
	$out['date_renewed'] = $status= ($obj->{'date_renewed'});
	$out['date_expiry'] = $status= ($obj->{'date_expiry'});
        
	return $out;

}
?>

// ————-file: License_clicked.php —————– //

<?php
require_once('license.php');

$data=License_clicked("http://www.name.com","87970825ef7727.22119413","5997084dcd47f");

$status= $data['status'];
$email= $data['email'];
$max_allowed_domains= $data['max_allowed_domains'];
$registered_domain= $data['registered_domain'];
$item_reference= $data['item_reference'];
$date_created= $data['date_created'];
$date_renewed= $data['date_renewed'];
$date_expiry= $data['date_expiry'];
$message="";

if ($status == "active") {
	if ($date_expiry > date(“Y-m-d”)) {
		if ($registered_domain == $_SERVER['SERVER_NAME']) {
			$message="License is: active";
		} else {
		   $message="not registered domain";
			}	
	}else {
		$message="License is expiry";
		}
} else {
	switch ($status) {
		case "expired":
			$message="status is: expired";
			break;
		case "pending":
			$message="status is: pending";
			break;
		case "blocked":
			$message="status is: blocked";
			break;
		
    }   
}
echo $message;	
?>