Hi, I am an expert web push notification development offering more than 7 years experiences.
Web push notification is working on chrome, firefox, opear, safari.
To send subscriber notification, we need to their subscription. This subscription should be involved the endpoint, expiration time, auth, p256dh. I can finish your job perfectly.
And we need to embed the sdk using vanilla javascript in your website.
Looking forward to hearing from you soon.
Thanks.
Sotin