Чтобы получить маршрут по точкам нужно использовать запрос gis_get_route:

POST https://routing-maps.wialon.com/hst-api.wialon.com/gis_get_route

Params (should be encoded by application/x-www-form-urlencoded, colon-separation provided for readability):

lat1: 53.87159
lon1: 27.48803
lat2: 53.9225
lon2: 27.51343
flags: 1
uid: 14809662
sid: 022df8......

{
    "status": "OK",
    "points": "kvxgIutwf...", (points encoded as Google Polyline)
    "distance": {
        "text": "9.30 km",
        "value": 9299.13964844
    },
    "duration": {
        "text": "10 min",
        "value": 611
    }
}