Properties within Polygon

Returns the properties within an custom polygon that represents a multi-city area or smaller. The coordinates of the polygon should be in [GeoJSON format](https://tools.ietf.org/html/rfc7946) and the polygon must conform to the following restrictions: * Polygon size - diagonal distance of the polygon must be less than 500km * Polygon type - only single polygons are supported * Number of coordinates - must be <= 2000