Get more data of user Linked in extension

hello my friend!

I test your code and works well but i get many information about user but not email!

I used helix like you

fetch(
        'https://api.twitch.tv/helix/users/?id=' + channel_id,
        {
            method: 'GET',
            headers: helix,
        }
    )

but i get public data and i need email, i saw that you can get app acces token how to get

{
        client_id: config.client_id,
        client_secret: config.client_secret,
        grant_type: 'client_credentials'
    }

the flow is:

get user Id with helix , get app acces token with https://id.twitch.tv/oauth2/token (i dont know if that show a login popo up) and with this result token i will try to get private data email?

thanks