WC_Email_Customer_Processing_Order::get_content_html PHP Method

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