code: function getPublicPayMachines(latitude, longitude, radius, params, callback) {
      if(!latitude || !longitude || !radius) {
        callback(new Error("Parking.getPublicPayMachines: latitude, longitude and radius required"));
        return;
      }
      params = params || {};
      params.latitude = latitude;
      params.longitude = longitude;
      params.radius = radius;
      core.callApi('/ParkingService/v1.0/PublicPayMachines', params, callback);
    }
docs: Returns all public pay machines.
  
  @memberof module:gbgcity/Parking
  @param {String|Number} latitude The latitude of the location around which to explore.
  @param {String|Number} longitude The longitude of the location around which to explore.
  @param {String|Number} radius The radius of the area to explore.
  @param {Object} [params] An object containing additional parameters.
  @param {Function} callback The function to call with results, function({Error} error, {Object} results)/
  @see http://data.goteborg.se/ParkingService/v1.0/help/operations/GetPublicPaymachines