Cancelling license

I signed up and paid for a SketchUp shop license seven days ago. I don’t want to keep using the product. The user interface is different from what I know (SketchUp Make) and I don’t want to have to relearn how to use it. How do I cancel and hopefully get a refund?

Thank you. I stumbled over that after I posted my inquiry. Too soon to tell if it leads me anywhere useful.