How to verify FCM registration token on server?

Question

I got my Firebase Cloud Messaging registration token for web push. And I sent this to my server to save in database for later push. But how can I verify this token is valid

Answer 1

According to the docs, you can use validate_only for testing the request without actually delivering the message.

https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages/send