A Polygon can have more properties but usually the default is sufficient. The Mappedin'things' object is where you would specify what properties you want to download for Polygons. Only specify what you will actually use, to minmimze transfer time. Work with your Mappedin developer relations contact to set up any custom properties you need.
ID of Map that Polygon is located on.
Locations attached to the Polygon.
Ranking for this polygon.