code: public static void deleteWhiteListDomain(String domain) {
  		WhitelistDomainRequest request = new WhitelistDomainRequest();
  		request.addWhiteListedDomain(domain);
  		request.setDomainActionType(DomainActionType.REMOVE);
  		FbBotMillNetworkController.postThreadSetting(request);
  	}
docs: Removes a single domain on the list of domains that needs to be
  "white listed".
  
  @param domain
  the domain that needs to be removed.
  @see <a href=
  "https://developers.facebook.com/docs/messenger-platform/thread-settings/domain-whitelisting"
  >Facebook's Messenger Platform Domain Whitelisting Thread Settings
  Documentation</a>