How are the key cards suppose to work is there a gate for it, or what is it used for. I am trying to make so the keycards unlock a door, but don’t know even how to use them.
you can use a keycard for that certain item, tell me if this works! 
You can use this guide,
Or just place a vending machine and have it require a keycard, and wire it to a barrier and have it deactivate on purchase.
When button pressed > checker checks for specific key, if passes unlock gate / barrier deactivate.
Need me to show images?
If you want the thing from one way out, put the GateWay prop, a hidden button and vending machine, and require the keycard and wire it by channels(no memory) or wires(10 memory each)
You don’t need a checker, it uses a vending machine on a specific card, you don’t need to get that complex.
Ohhhh I’m sorry that’s just how i used it
Your fine, we all use thing differently because thats just how our brains work.
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