How to get device tokens (FCM registration tokens) from Firebase?
I'm making mobile app using firebase and its server using node.js.
I want to send push notification message from server, but I don't know how to get devices token.
How to get device tokens from external server? I'm using Firebase admin SDK now.
Is the device token only generated when the app is connected fcm server?
Should I save token to another database when user first run the app and register FCM server?
