WC_API_Server::get_raw_data PHP Method

    public function get_raw_data()
    {
        // $HTTP_RAW_POST_DATA is deprecated on PHP 5.6
        if (function_exists('phpversion') && version_compare(phpversion(), '5.6', '>=')) {
            return file_get_contents('php://input');
        }
        global $HTTP_RAW_POST_DATA;
        // A bug in PHP < 5.2.2 makes $HTTP_RAW_POST_DATA not set by default,
        // but we can do it ourself.
        if (!isset($HTTP_RAW_POST_DATA)) {
            $HTTP_RAW_POST_DATA = file_get_contents('php://input');
        }
        return $HTTP_RAW_POST_DATA;
    }