code: public static base_responses update(nitro_service client, sslcertkey resources[]) throws Exception {
  		base_responses result = null;
  		if (resources != null && resources.length > 0) {
  			sslcertkey updateresources[] = new sslcertkey[resources.length];
  			for (int i=0;i<resources.length;i++){
  				updateresources[i] = new sslcertkey();
  				updateresources[i].certkey = resources[i].certkey;
  				updateresources[i].expirymonitor = resources[i].expirymonitor;
  				updateresources[i].notificationperiod = resources[i].notificationperiod;
  			}
  			result = update_bulk_request(client, updateresources);
  		}
  		return result;
  	}
docs: Use this API to update sslcertkey resources.