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How apple or google specify a token to a user or app or maybe device?

for example for user X, with Device Iphone7, and Facebook, the apple generate one token or for user X, with Device Iphone7 the apple generate one or any others... also How google?

another question is in Web Application, How they specify tokens?

Mohammad Lashgarbolouk
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An FCM token is also known as a device instance ID; it identifies that specific app on that specific device.

If the same app is installed on another device, it will get a different device instance ID. This is even the case when it's the same user installing the same app, the instance ID on each phone will be unique.

When a different app is installed on the same device, it also gets its own device instance ID. So different apps will never share the token, no matter if they are on the same phone.

In this respect if you have multiple profiles on the same (Android) phone, they count as separate phones: if you install the same app on the same phone under two profiles, each instance of the app will get its own instance ID.

All of this means that you can target a specific app, on a specific profile of a specific phone with its token.

Frank van Puffelen
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  • Thanks a lot Frank, Well, How about APNS and also How Web application? – Mohammad Lashgarbolouk Jan 25 '18 at 05:13
  • iOS works the same. Web works similarly, but it more limited. For example: you can't subscribe to topics on FCM.js, nor can you send messages to web clients through the Firebase console. – Frank van Puffelen Jan 25 '18 at 05:21
  • You mean APNS specify a token for Device->user(maybe multi profile)->app and in the web application, if i open my gmail, in a multi windows in chrome, microsoft edge,firefox Simultaneous, how they send me a message – Mohammad Lashgarbolouk Jan 25 '18 at 05:26