[FR]: Subscribing to topic in Messaging for multiple projects is not supported?

[mirzemehdi]

Description

In android, we can get different instances for FirebaseMessaging and subscribe to topic for needed FirebaseMessaging. In iOS as I see from documentation only retrieveFCMTokenForSenderID and deleteFCMTokenForSenderID is available, but there is no way to subscribeToTopic for multiple firebase projects. How can we achieve that?

Android: https://firebase.google.com/docs/cloud-messaging/android/topic-messaging#subscribe_the_client_app_to_a_topic

Related issue: (#154 (comment))

API Proposal

Support for subscribeToTopic and unSubscribeToTopic for multiple firebase projects.

Firebase Product(s)

Messaging

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