$username = 'batb-xxxxxx';
    $password = 'XXXXXXXXXXXX';
    $context = stream_context_create(array(
        'http' => array(
            'header'  => "Authorization: Basic " . base64_encode("$username:$password")
        )
    ));

    // fichier source
    $json = file_get_contents('http://crm.capvaleur.group/export', false, $context);