I bought a xbox controller a long time ago where I got the code for the Dark Vertex skin in Fortnite and would have the question how I can redeem it on ps4 since I only have a ps4.
I think on the Epicgames side.
Go to the internet epicgames since → register with your epic acc → somewhere redeem code should be available as a choice
https://www.epicgames.com/...dated=true
But make sure that you are logged in, otherwise the code will be lost.