code: public static UserChannelUpdater updater(final String pathServiceSid, 
                                               final String pathUserSid, 
                                               final String pathChannelSid, 
                                               final UserChannel.NotificationLevel notificationLevel) {
          return new UserChannelUpdater(pathServiceSid, pathUserSid, pathChannelSid, notificationLevel);
      }
docs: Create a UserChannelUpdater to execute update.
  
  @param pathServiceSid The SID of the Service to update the resource from
  @param pathUserSid The SID of the User to update the User Channel resource
  from
  @param pathChannelSid The SID of the Channel with the User Channel resource
  to update
  @param notificationLevel The push notification level to assign to the User
  Channel
  @return UserChannelUpdater capable of executing the update