You can also use "Postman"
$theAPIkey = ''; // x-api-key
$theAPIapp = ''; // x-api-application
$theURL = '';
$timeout = 5; // set to zero for no timeout
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $theURL);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_HTTPHEADER, array(
'x-api-key' . $theAPIkey,
'x-api-application' . $theAPIapp
));
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$response = curl_exec($ch);
echo '<pre>';
print_r($response);
echo '</pre>';
curl_close($ch);