Transferring a new store code to an account-how to connect apps and sales channels?

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Hi! My issue here is that I am working on a redesign for a client , and it's almost done. When I transfer the theme code to them, I have a lot more to do, because this is an already live store with 6-7 sales channels and multiple apps. When I transfer it, what do I need to do to connect all of the apps and sales channels to the new active theme?

Thanks in advance for your help!