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Is there any constraints about number of different topics for Firebase Cloud Messaging in one app?
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No I don't think so!
Seems like you can create topics when you need them!
Nope. Seeing that FCM has GCM as its core, there is no limit in the number of Topics for any app. There used to be a 1 million limit, but it was removed. You can refer to this Google Developers Blog for that.
Also, when creating a Topic in FCM, it could take up to 24 hours for it to be show up in the Firebase Console, as per this post. Cheers! :D