code: public static WebhookCreator creator(final String pathServiceSid, 
                                           final String pathChannelSid, 
                                           final Webhook.Type type) {
          return new WebhookCreator(pathServiceSid, pathChannelSid, type);
      }
docs: Create a WebhookCreator to execute create.
  
  @param pathServiceSid The SID of the Service to create the resource under
  @param pathChannelSid The SID of the Channel the new resource belongs to
  @param type The type of webhook
  @return WebhookCreator capable of executing the create