Noptin_Page::do_shortcode( $atts )

	public function do_shortcode( $atts ) {

		// Abort early if no action is specified.
		$action = $this->get_request_action();
		if ( empty( $action ) ) {
			return '';
		}

		// Retrieve the optional value.
		$value = $this->get_request_value();

		ob_start();

		do_action( "noptin_page_$action", $value );

		return ob_get_clean();

	}