Geocoding TimeMap - send request

// Sends the request of the Time Map multipolygon.
function sendTimeMapRequest(coordinates, map) {
      
  var latLng = { lat: coordinates[0], lng: coordinates[1] };
  var departureTime = new Date().toISOString();
  var travelTime = 30*60; // 30 minutes
  
  var request = {
    departure_searches: [ {
      id: "first_location",
      "coords": latLng, 
      transportation: {
        type: "driving"
      },
      departure_time: departureTime,
      travel_time: travelTime
    } ],
    arrival_searches: [] 
  };

  $.ajax({
    url: "http://api.traveltimeapp.com/v4/time-map",
    type: "post",
    headers: authHeaders,
    data: JSON.stringify(request),
    contentType: "application/json; charset=UTF-8",
    success: drawTimeMap(map)
  });
}; 

// A helper function that converts [{lat: <lat>, lng: <lng>}, ...] to a [[<lat>, <lng>], ...] format.
function ringCoordsHashToArray(ring) {
  return ring.map((latLng) => { return [latLng.lat, latLng.lng]; } );
};

// Draws the resulting multipolygon from the response on the map.
function drawTimeMap(map) {
  // We are returning a function so that it can be easily used in the success parameter of the ajax method.
  return (response) => { 
    // Reference for the response: http://docs.traveltimeplatform.com/reference/time-map/#response-body-json-attributes
    var shapesCoords = response.results[0].shapes.map((polygon) => {
      var shell = ringCoordsHashToArray(polygon.shell);
      var holes = polygon.holes.map(ringCoordsHashToArray);
      return [shell].concat(holes);  
    })
    var polygon = L.polygon(shapesCoords, {color: 'red'});
    polygon.addTo(map);
    map.fitBounds(polygon.getBounds());
  };
};