Get number of subs a Twitch streamer has

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My token is type “Bearer”, which I get by making a post request to https://id.twitch.tv/oauth2/token.

This is the result I get from the post request

{
“access_token”: “****************************”,
“expires_in”: 5284987,
“token_type”: “bearer”
}

I haven’t declared a response type.

Does the streamer/broadcaster has to authorise the access??

Aren’t we able to search freely for the subs count of any streamer? Why is that?

Thanks!