How to create a coin system?

Hello,

So I was wondering if someone could help me with this little system I am trying to make. I am making a game that has coin scattered around the map. What would be the best way to have players collect them? The point is once they find a White coin they can get 2 points. Would the best way to be putting a value in the player and just adding to that value? How would I tell what player touched it? Would I use an OnTouch?

Thanks,

Anthony