How and where do you create socket, join channel and process message?

[freewebwithme]

Hi
This is not an issue. Sorry for this.
But There is no place to ask about.
I wonder if you guys where you connect socket? and joining channel and where to process incoming message from channel?
In my case, for cart channel, I created it when user log in and register as singleton using GetIt package.
So I can get cart channel anywhere where I want it like getIt<PhoenixChannel>();

But in case of order channel, I need to join multiple channel in case of user orders multiple order.
in this case, how do you handle this? joinning multiple channel, and get stream message from those.