private function get_content_html() {

		add_filter( 'llms_user_info_shortcode_user_id', array( $this, 'set_shortcode_user' ) );

		$codes = apply_filters(
			'llms_certificate_merge_codes',
			array(
				'{site_title}'    => $this->get_blogname(),
				'{user_login}'    => $this->user_login,
				'{site_url}'      => $this->account_link,
				'{first_name}'    => $this->user_firstname,
				'{last_name}'     => $this->user_lastname,
				'{email_address}' => $this->user_email,
				'{student_id}'    => $this->userid,
				'{current_date}'  => date_i18n( get_option( 'date_format' ), current_time( 'timestamp' ) ),
			),
			$this
		);

		$this->find    = array_keys( $codes );
		$this->replace = array_values( $codes );

		$content = $this->format_string( $this->content );

		// In certain circumstances shortcodes won't be registered yet.
		LLMS_Shortcodes::init();

		ob_start();
		llms_get_template(
			$this->template_html,
			array(
				'email_message' => do_shortcode( $content ),
				'title'         => $this->title,
				'image'         => $this->image,
			)
		);

		remove_filter( 'llms_user_info_shortcode_user_id', array( $this, 'set_shortcode_user' ) );

		return ob_get_clean();

	}