PHP

<?php

$password="YOUR_NETATMO_API_PASSWORD";
$username="YOUR_NETATMO_API_EMAIL";

$app_id = "APP_ID_FROM_API";
$app_secret = "APP_SECRET_FROM_API";

$token_url = "https://api.netatmo.net/oauth2/token";
$postdata = http_build_query(
        array(
            'grant_type' => "password",
            'client_id' => $app_id,
            'client_secret' => $app_secret,
            'username' => $username,
            'password' => $password,
            'scope' => "read_camera"
    )
);

$opts = array('http' =>
    array(
        'method'  => 'POST',
        'header'  => 'Content-type: application/x-www-form-urlencoded',
        'content' => $postdata
    )
);

$context  = stream_context_create($opts);
$response = file_get_contents($token_url, false, $context);

$params = null;
$params = json_decode($response, true);
$api_url = "https://api.netatmo.net/api/getuser?access_token=" . $params['access_token'];
$requete = file_get_contents($api_url);

$url_welcome = "https://api.netatmo.net/api/gethomedata?access_token=" . $params['access_token'] . "&size=1";

$welcome = file_get_contents($url_welcome);

echo $welcome;

?>