Once I get the cp gifted to my account on blizzard, how do I then get those cp to my activision account? I play on ps4

You don't. CP on pc will be separate from cp on ps4.

Crap, well I accepted the balance unfortunately. What can I do with it now? How can I get a refund?

You can’t.

But you could download Warzone for free buy what you need and the items will be shared on your ps4.

The only exception to this is stuff from the cod store with the clan skins. They will not transfer. But all the skin packs in the daily shop will

I literally only wanted the cp to buy skins and other stupid BS

Maybe I can badger blizz into refunding it