WC_Email_Customer_Invoice::get_content_plain PHP Метод

        public function get_content_plain()
        {
            return wc_get_template_html($this->template_plain, array('order' => $this->object, 'email_heading' => $this->get_heading(), 'sent_to_admin' => false, 'plain_text' => true, 'email' => $this));
        }