Great! Ended up getting it. It was a little unclear about having the client id as header from the docs. I guess I was just going in circles with the API docs because of this transition of v5 to current. A lot of other links were dead ends so it was very frustrating.
Anyway, here is what I ended up with, makes a ton of sense now:
$.ajax({
url: “https://api.twitch.tv/helix/users?id=” + payload.user_id,
method: “GET”,
headers:{
“Client-ID”: “xxxxxxxxxxxxxxxxxxxxx”
},
success: function(data){
console.log(data);
}
});