Check out this on the Points System: The Points System
And to show the reader they lost or gained a point, you can use a readerMessage.
Here’s a thread on how to add a readerMessage into your story: Reader Messages / Text Effects Guide Updates
You’d write
readerMessage <text>
And <text> would be replaced with what you want to appear.
Example:
readerMessage The MC has a crazy addiction to cupcakes.