firebase

1. add firebase project .
2. After createing project click "+ Add app" button then select web platform .
3. create firebase config variable .
4. add that variable in firebase-inti.js file .
5. add messagingSenderId in firebase-messaging-sw.js file .
6. add header-footer.php file link and script perfect place .
7. when send notification that time use curl.php file function .
8. firebase-messaging-sw.js file in project root folder . eg(/xampp/htdocx/firebase-messaging-sw.js)
9. firebase notification is work only localhost and https url.