As per requirement I do not have Registration Token of user and I need a way to unsubscribe Topic of particular user/subscriber.
I am new to FCM, by referring documentation related to FCM I am getting below ideas to implement the same. But I am not finding a way to implement the same.
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Is there a way to unsubscribe particular Topic of user without using Registration Token ?
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Is there a way to unsubscribe Topic using other Topic of FCM?
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Can I register user in FCM using any custom ID value like One signal has external_id, using that we can edit custom_data of it.
Can anyone please let me know how can I implement it?