FireBase Push Mass messages use v1.

I am moving application from old FCM functionality to new V1 according https://firebase.google.com/docs/cloud-messaging/migrate-v1?hl=en

However in the old functionality has had the ability to push mass messages by single request.

Do we have ability to do it use new V1?

Messages can be sent to many receivers using Topics but there is no ability to send to multiple registration tokens or users in a single invocation.

Hi Joe.

In short: Yes

For context as mentioned in the Topic Messaging docs for iOS and Android:

"
Topic messaging supports unlimited subscriptions for each topic. However, FCM enforces limits in these areas:

• One app instance can be subscribed to no more than 2000 topics.
• If you are using batch import to subscribe app instances, each request is limited to 1000 app instances.
• The frequency of new subscriptions is rate-limited per project. If you send too many subscription requests in a short period of time, FCM servers will respond with a 429 RESOURCE_EXHAUSTED ("quota exceeded") response. Retry with exponential backoff.

I understood. Last question, where can I see the limit quota that can trigger 429 RESOURCE_EXHAUSTED?

According to About FCM messages ::Topic message limit, it is 3000 QPS.