How push notifications works?

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How Push Notifications Works?
By - Pushmaze
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• The core of push notifications is run through
  services like Apples APNS, Googles Firebase
  Cloud Messaging (FCM) and Windows Notification
  service.

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• Let us take the case of FCM which makes it
  possible for both web and mobile applications to
  send notifications to subscribers. The three key
  steps to implementing push messages are as
  follows

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1. Adding the client-side logic with your apps
   JavaScript and UI that registers a user to Popup
   messages.

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• First step involves two things receiving
  permission from the user to send push messages,
  and getting a Push Subscription from the
  browser.

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• 2. Sending a push message to the users device
  via an API call to your applications back-end.

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• An API call is to be made to the push service,
  which would include what data to send, whom to
  send and how to send the message. Usually, the
  API call is made from your servers end.

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What is push message service and what does it do?

• A push service validates the push message and
  sends it to the respective browser. Each browser
  can use any push service they want, as every push
  service expects the same API call.

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• 3. When push arrives on the device, an
  event-driven JavaScript worker file will receive
  a push event, enabling you to show the
  notification.

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• Once you have sent a push message, the push
  service will keep your message on its server
  until
• -The device comes online and the message is
  delivered by the push service.
• -If the message expires, the push service removes
  it from the queue and will be no longer valid.

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• Once a push service delivers the message, the
  browser receives it, decrypts and dispatches a
  push event in your service worker (a special
  JavaScript file that helps to execute JavaScript
  even if the browser is closed.

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