Firebase push notification

I'm trying push notification with firebase and b4a Ver. 6.0

with filrebase console i can send a push to all devices
or send to single device with token/gcm_id.

can i use a SubscribeToTopic different for each user/devices?

I'm trying to figure out if I can avoid to store gcm_ic/token into my server
and use a unique attribute for my user,
for example the email and send push to all devices that uses.

Thanks

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