The "verticesAsJsonString" parameter must be a stringified JsonArray object containing the polygon vertices.
These vertices must be JsonArray objects too, and must contain the latitude first and the longitude second in the WGS84 projection.
Therefore, the latitude value must be between -85 and +85 and the longitude one must be between -180 and +180.
For a polygon , you need at least 4 vertices in the "verticesAsJsonString" parameter and the first and the last vertice must be the same.
For a polyline , you need at least 2 vertices in the "verticesAsJsonString" parameter.
For a point, ex : [[lat, lng]]