Invalid key pada rajaongkir pada starter/cost

<?php
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL,"https://api.rajaongkir.com/starter/cost?origin=501&destination=114&weight=1000&courier=jne&key=92951e2589432cf79a82d9946fff895e");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,
            "dispnumber=567567567&extension=6");
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded'));

// receive server response ...
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$server_output = curl_exec ($ch);

curl_close ($ch);

var_dump($server_output);

?>