let prefTravel = "driving"
    let apiKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

    let url = URL(string: "https://maps.googleapis.com/maps/api/directions/json?origin=(origin)&destination=(destination)&mode=(prefTravel)&key=(apiKey)")

    Alamofire.request(url!).responseJSON { response in

        print(response.request as Any)  // original URL request
        print(response.response as Any) // HTTP URL response
        print(response.data as Any)     // server data
        print(response.result as Any)   // result of response serialization
        do {
            let json = try JSON(data: response.data!)
            let routes = json["routes"].arrayValue
            // print route using Polyline
            for route in routes
            {
                let routeOverviewPolyline = route["overview_polyline"].dictionary
                let points = routeOverviewPolyline?["points"]?.stringValue
                let path = GMSPath.init(fromEncodedPath: points!)
                let polyline = GMSPolyline.init(path: path)
                polyline.strokeWidth = 4
                polyline.strokeColor = UIColor.red
                polyline.map = self.mapView
            }
        } catch let err {
            print(err)
        }
    }
}```