curl --request GET \
  --url https://sandbox.tight.com/v6/mileage/{mileageId}/route \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "mrt_12345",
    "waypoints": [
      {
        "lat": "38.8977",
        "lng": "-77.0365"
      }
    ],
    "status": "ACTIVE",
    "customData": {
      "internal_key": "some_internal_key",
      "some_other_field": 23434
    }
  }
}