Firebase Cloud Messaging (FCM) - HTTP V1 API or Legacy HTTP API?

Question

Our goal is sending notifications to groups of devices from our backend, and only from server side is possible to know which device should receive the notif

Answer 1

This page suggests that you should stay with the legacy API if you want to continue to use the multicast feature: https://firebase.google.com/docs/cloud-messaging/migrate-v1

Any apps that use device group messaging or multicast messaging, however, may prefer to wait for future versions of the API. HTTP v1 does not support these features of the legacy API.