Authorization for subscribed members

I’m developing a quiz API app which requires authorization for only-subscribed members can see.

How to do that? I’m thinking of putting metadata (is_subscribed) to true for subscribed member and give the scope so he/she can gain permissions.

I only know how to give to scope to the clients (which includes ALL users), which I don’t want it to happen

If I use authorization extension, I don’t know how to check if the user’s given the role to access the API.
But, I don’t know how to do it. Please help.

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