Traps

Hello, So I am trying to build a pathfinder campaign and I am placing traps, and pits in different areas, what are the different ways to have traps in place on the maps or what has worked out for you? Is there a way to layer so that they cant see it until you have them roll for a perception or anything? thank you in advance for you help, and sorry if its been addressed before.

Place the traps on the GM layer, and the players won't be able to see it. Once they can see the trap (either by noticing it or springing it!), move it to the token or map layer, as desired.

awesome, thank you very much.