Developer Portal

using (WebClient client = new WebClient())
{
    client.Headers.Add("Authorization", "YOUR_ACCESS_KEY");
    byte[] response =
    client.UploadValues("http://rest.sendmode.com/v2/hlr", new NameValueCollection()
    {
        { "mobilenumber", "0870000000" }
    });

    string result = System.Text.Encoding.UTF8.GetString(response);
}

$url = 'https://rest.sendmode.com/v2/hlr';
$data = array('mobilenumber' => '0870000000');

$options = array(
    'http' => array(
        'header'  => "Content-type: application/x-www-form-urlencoded\r\n" .
            "Authorization: YOUR_ACCESS_KEY\r\n",
        'method'  => 'POST',
        'content' => http_build_query($data)
    )
);
$context  = stream_context_create($options);
$result = file_get_contents($url, false, $context);

HttpClient httpclient = HttpClients.createDefault();
HttpPost httppost = new HttpPost("https://rest.sendmode.com/v2/hlr");
httppost.setHeader(HttpHeaders.AUTHORIZATION, YOUR_ACCESS_KEY);

List<NameValuePair> params = new ArrayList<NameValuePair>(1);
params.add(new BasicNameValuePair("mobilenumber", "0870000000"));
httppost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));

HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();