code: public static base_response update(nitro_service client, aaacertparams resource) throws Exception {
  		aaacertparams updateresource = new aaacertparams();
  		updateresource.usernamefield = resource.usernamefield;
  		updateresource.groupnamefield = resource.groupnamefield;
  		updateresource.defaultauthenticationgroup = resource.defaultauthenticationgroup;
  		return updateresource.update_resource(client);
  	}
docs: Use this API to update aaacertparams.