Use Availability Checker on All Pages 3
The below article is for WooFood , Food Ordering Plugin for WordPress and WooCommerce. If you don't already have it . Please take a look on the product page

User Availability Checker on All Pages

add_action("wp_footer", "wpslash_add_availabilty_checker_on_footer");
function wpslash_add_availabilty_checker_on_footer()
{


echo do_shortcode("[woofood_availability_popup]"); 

}
The above article is for WooFood Food Delivery Plugin for WooCommerce