Saving user data in backend

Extensions Ideas
1

Hi can I somehow save user identifier in database to be able to retrieve data anytime.
And is there any unique identifier for user that is not changing

2

Yes.

But you’ve posted under extension ideas.

And your question doesn’t make 100% sense

What are you trying to do?

3

I need to save data for broadcaster in backend. I need to know broadcaster user id to know that configuration belongs to that user

4

In the backend of what? I assume you mean a Twitch Extension, but you have not said

You can Parse the passed JWT to collect the broadcaster/channel/user_id