Get player who Triggered the On Clicked Event?

I am using a widget component in the world, in my case a vending machine. I want to add ammo to the player that clicks it (I’m making a split-screen game) but I need a way of “Getting” who clicked the button
Does anybody know how I could do this?

Found this : How to receive click events (and know who clicked me)? - UE4 AnswerHub
Hope it helps !