WC_API::handle_api_requests PHP Method

    public function handle_api_requests()
    {
        global $wp;
        if (!empty($_GET['wc-api'])) {
            $wp->query_vars['wc-api'] = $_GET['wc-api'];
        }
        // wc-api endpoint requests.
        if (!empty($wp->query_vars['wc-api'])) {
            // Buffer, we won't want any output here.
            ob_start();
            // No cache headers.
            nocache_headers();
            // Clean the API request.
            $api_request = strtolower(wc_clean($wp->query_vars['wc-api']));
            // Trigger generic action before request hook.
            do_action('woocommerce_api_request', $api_request);
            // Is there actually something hooked into this API request? If not trigger 400 - Bad request.
            status_header(has_action('woocommerce_api_' . $api_request) ? 200 : 400);
            // Trigger an action which plugins can hook into to fulfill the request.
            do_action('woocommerce_api_' . $api_request);
            // Done, clear buffer and exit.
            ob_end_clean();
            die('-1');
        }
    }