I tryed to usted Helix token but this endpoint https://api.twitch.tv/helix/users?id=${auth.userId}`. Response me auth token IS not valid.
I think that the scope of this token dont allow for using in this scope but i dont know.
You have any referenceor example similar of my case?
I try to follow your links but if i can do It with Helix token please teach me how to!!