public function nouvello_upload_csv_file($data)
{
 
    $body = $data->get_body();
    $body_array = json_decode($body, true);
    $body_json_data = $body_array[0]['json_data'];
    $body_array_data = json_decode($body_json_data, true);
 
    $csv_data = $body_array_data['file_data'];
    $csv_nm = $body_array_data['file_nm'];
    $csv_label = $body_array_data['csv_label'];
 
    $ext = end(explode('.', $csv_nm));
    $fn_name = time() . '.' . $ext;
    $wp_upload_dir = wp_upload_dir();
    $filepath_nm = $wp_upload_dir['path'] . $fn_name;
 
    $f = fopen($filepath_nm, 'a');
    fputcsv($f, $csv_label);
 
    foreach ($csv_data as $csv_inner) :
        fputcsv($f, $csv_inner);
    endforeach;
 
    fclose($f);
 
    $result = array(
        'file_path' => $filepath_nm,
        'file_nm' => $csv_nm,
    );
 
    return json_encode($result);
}