Synology Calendar API

$curl = curl_init('https://IP:PORT/webapi/entry.cgi);  
curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query(array(
					'api'				=>	'SYNO.Cal.Event',  
					'method'			=>	'delete',  
					'version'			=>	2,  
					'evt_id'			=>	'4972'  
				)));
curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");  
curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($curl, CURLOPT_COOKIE, 'id='.$sid);  
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
'X-SYNO-TOKEN: '.$synotoken  
));


echo json_decode(curl_exec($curl), TRUE);

Array
(
    [error] => Array
        (
            [code] => 103
        )

    [success] => 
)