Handling Invalid Token responses

[excid3]

Hey there! I'm new to FCM, but I was curious are these the two responses we should be using to remove tokens when they're invalid?

Make sure to detect invalid token responses from FCM and respond by deleting from your system any registration tokens that are known to be invalid. With the HTTP v1 API, these error messages may indicate that your send request targeted stale or invalid tokens:

• UNREGISTERED (HTTP 404)
• INVALID_ARGUMENT (HTTP 400)

https://firebase.google.com/docs/cloud-messaging/manage-tokens#detect-invalid-token-responses-from-the-fcm-backend

If that's correct, I'd be happy to add an example to the readme for anyone else new to this. 👍

[sabman]

Seems correct to me based on the documentation. Can someone else who is using fcm in production also confirm this?

[exarus]

@sabman I wonder how does these match the codes described here: https://firebase.google.com/docs/cloud-messaging/send-message#admin