I'm able to access a list of hooks, but can't seem to find methods and properties of items like cards and card readers.  I'd like to write a plugin that does something based on whether the card is green/blue/red etc and not sure what properties to use.

Is there an entire section of entities that i'm not seeing?

thanks in advance

You can find all of what the game provides by using a .NET decompiler and viewing the DLLs such as Assembly-CSharp.dll. Some recommended decompilers are ILSpy, dnSpy, JustDecompile, Codemerx, etc.

dude, I really appreciate that - thank you.
just submitted my first plugin - Puzzle Points.  Still awaiting approval.   Cheers!