What is APNs authentication key?

The authentication key (also called the Apple Push Notification Service (APNS) token) is a one-time-use identifier used to identify your app. If your app has already been approved by Apple, then it can request an authentication key for your app. The authentication key is associated with your app's bundle identifier. You can find out more about how the key works in the iOS Security Overview.

What should I do if I am not sure that the APNs token has been generated successfully? On macOS, the remote notifications service runs as a background task, but on iOS it runs as a foreground service.

How do I add APNs authentication key to Firebase?

I have managed to add the authentication key to my iOS app, but I am facing difficulties with Firebase.

I am using Xcode 7.3 with swift2.0 and firebase 4.6.5
The following line gives me issue: ")
else if let response = response.
If I change https.request to http.request, then I don't get any response (0 bytes) from Firebase and also when I look at the network of app I can see APNs requests instead of sending FCM messages.

Let request = URLRequest(url: url). Request.addValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type") request.addValue("text/plain", forHTTPHeaderField: "Accept") request.addValue("APN Test 2", forHTTPHeaderField: "Sender ID") request.addValue("(token)", forHTTPHeaderField: "Authorization") request.httpMethod = "POST" let data = try! JSONSerialization.data(withJSONObject: parameters, options: JSONSerialization.WritingOptions.prettyPrinted)

Request.httpBody = data Is there any way to add an authentication key or is it necessary to do it on server side

As mentioned by @BakhtiariMoein in the comments.

What is the difference between APNs token and FCM token?

Do I need to include both the tokens in my request?

Why? Is this the right approach? What is the default FCM token, any specific type for iOS & Android app and Android app? Is FCM token only available when I send messages to the server from the mobile client itself (not necessarily when using push notification) or is it generated automatically by the server. Do I have to specify the device token at all in the message payload or the server does that itself? It's pretty self-explanatory, APNs token is sent to the backend in all cases (both for web push and firebase), while FCM is only sent in the case of a direct client-to-server push. The token is sent in all requests to the backend. You can use any string as a token. If you choose to use server side push for sending messages, you will get the device token as an argument. Source: FCM token (or GoogleApiClient.ConnectionCallbacks) is used only to initiate connection. For notifications (Android, and Chrome browser) it's not even necessary, so server generates an FCM token, pushes it to the client with the notification payload, and the client gets it using GoogleApiClient.OnConnectionFailedListener.onConnected().

This one requires your own generated token, if you send directly the client-server payload you'll get the FCM token as an argument, so you could have both and use it as you wish. The FCM token is sent only for android app and web push, therefore the default token is generated by FCM itself (so you should use FCM for the first time).

When you send a message, either directly to the server or through the client application, you need to specify only the token, the device token or ID, if needed (the push notification payload doesn't send the token to the server, hence server doesn't know it). So you have to set the token to a GoogleApiClient.ConnectionCallbacks in the client application.

How do I get the authorization key for Firebase?

To retrieve the authorization key for a project created by Firebase in a different console, go to "Database" > "Advanced", then click on "Projects" and select your project from the list.

The "Generate new key" button is at the bottom of the page.

Update: If you use the latest version of the Firebase CLI, you can't generate keys using the web console anymore; you have to use the command line. If the link provided by @matt didn't work for you, it's possible that you are using an account without access to the "Create Project" permission. If you are, you should log into the Firebase console and then click on "User permissions".

Select the "Create Project" permission and then click on "Grant Permission" to add the permission. Now it should work fine.