After reading the docs on https://learn.microsoft.com/en-us/azure/notification-hubs/notification-hubs-push-notification-registration-management and https://learn.microsoft.com/en-us/rest/api/notificationhubs/create-overwrite-installation I am using the restful Api format for notification hub. I understand that I require installation id and push channels and user id to finish the push notification. But the explanation of these three fields does not seem very clear to me. The senario: The frontend App will request Apple Push Notification System for a token. Then he will send the token to my backend Api. Then In order to fill in these three fields, should I put the token as the installation Id and put the user's email in database as the user Id? I have no idea where to fetch the content to fill in the push channel field. Thank you very much!

@Mike V , The token from APNS is the push channel. We sometimes also refer to this as the device/PNS handle . Installation ID and user ID are user-defined (as per your requirement/as in your case) From the 2nd doc’s link you'd shared- “Create or overwrite an installation” – Request body ‘pushChannel’ is ‘The PNS handle for this installation (in case of WNS the ChannelUri of the ApplicationTile).’ You can see the JSON example here: { "installationId": "12234", "userID": "MyAmazingUser", "tags": ["foo", "bar"], "platform": "apns", "pushChannel": "ABCDEF-123456-…" } For other related Notification metrics, you may wish to see the thread I'd responded here: decipher metrics

Understand the concept of instllationid and push channels in azure notification hub

Accepted answer

ajkuma 27,431 Reputation points Microsoft Employee

2021-07-30T18:40:35.037+00:00
@Mike V ,

The token from APNS is the push channel. We sometimes also refer to this as the device/PNS handle. Installation ID and user ID are user-defined (as per your requirement/as in your case)
From the 2nd doc’s link you'd shared- “Create or overwrite an installation” – Request body ‘pushChannel’ is ‘The PNS handle for this installation (in case of WNS the ChannelUri of the ApplicationTile).’

You can see the JSON example here:

{ "installationId": "12234", "userID": "MyAmazingUser", "tags": ["foo", "bar"], "platform": "apns", "pushChannel": "ABCDEF-123456-…" }

For other related Notification metrics, you may wish to see the thread I'd responded here: decipher metrics
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ajkuma 27,431 Reputation points Microsoft Employee

2021-07-30T18:45:47.14+00:00

@Mike V , Additionally, just to highlight on how Notification Hubs pushes notifications to a device:
Also, I have relayed your feedback internally.

In a typical send notification flow, the message is sent from the application back end to Notification Hubs.

1.Notification Hubs processes all the registrations. It takes into account the configured tags and tag expressions to determine targets.
Targets are the registrations that need to receive the push notification

2.With the targets established, Notification Hubs pushes notifications to the push notification service for the device platform. Notification Hubs pushes notifications split across multiple batches of registrations.

3.It authenticates with the respective push notification service, based on the credentials you set in the Azure portal, under Configure Notification Hub.
The push notification service then forwards the notifications to the respective client devices.

4.The final leg of notification delivery is between the platform's push notification service and the device.

Kindly see these docs for more details:

Frequently asked questions
Notification Hubs misconfiguration

Mike V 41 Reputation points

2021-08-05T01:56:41.427+00:00

Great thanks for your answers. Thank you !

ajkuma 27,431 Reputation points Microsoft Employee

2021-08-05T07:11:31.583+00:00

MikeV-4658, Glad you found the information helpful. Thanks for the update. Much appreciate your great feedback.

Mike V 41 Reputation points

2021-08-09T09:03:51.88+00:00

@ajkuma , Hello. What if now I need to use registration instead of installation, may I ask what is the relationship between registration Id and device token/ push token? Can I use the device token as the registration ID? Can I regard the installationId same as the registrationId?

I know that there is an api to create registration Id from notification hub, or it can be auto-generated from the registration process, But there is no api to generate installationId, which is weired.

Thank you

ajkuma 27,431 Reputation points Microsoft Employee

2021-08-10T20:42:58.937+00:00

@Mike V , Kindly find the answers to your follow-up questions:

1.What if now I need to use registration instead of installation?
You use the same send API calls. If you need to target a particular registration or group of registrations, you can use tags.

2.What is the relationship between registration Id and device token/ push token?
Registration IDs are generated by NH (Notification Hub) and be used to identify a particular device. The device token is a property on the registration.

3.Can I use the device token as the registration ID?
No, please see #2

4.Can I regard the installationId same as the registrationId?
No installations and registrations are different models. There are a number of advantages to the installations model.
Kindly see this doc https://learn.microsoft.com/azure/notification-hubs/notification-hubs-push-notification-registration-management#installations for more information.

5.I know that there is an API to create registration Id from NH, or it can be auto-generated from the registration process, But there is no API to generate installationId -what’s the recommended approach?
Installation IDs are just special tags, so they are user-defined. See the docs linked in #4.
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