Forums Scripts & Popups [Twitch] Join/Part command update?

So I'm trying to work with this new update which I guess makes the join and part command obsolete?
What I'm trying to understand is do I have to ask for membership permission for every command I use or just when starting the IRC connection?
I know I have to use this but I'm still not certain where.
/raw CAP REQ :twitch.tv/membership