php curl get request body

$timeout=5;
$auth=array(
	'WebApiSession: '.$WebApiSession,
);
$curl=curl_init();
curl_setopt($curl,CURLOPT_CONNECTTIMEOUT,$timeout);
curl_setopt($curl,CURLOPT_TIMEOUT,$timeout);
curl_setopt($curl,CURLOPT_URL,$url);
curl_setopt($curl,CURLOPT_HEADER,0);
curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
curl_setopt($curl,CURLOPT_HTTPHEADER,$auth);
curl_setopt($curl,CURLOPT_CUSTOMREQUEST,'GET');
curl_setopt($curl,CURLOPT_POSTFIELDS,$booking_data);
$result=curl_exec($curl);