docs: public ApnsServiceBuilder asBatched(int waitTimeInSec, int maxWaitTimeInSec, ScheduledExecutorService batchThreadPoolExecutor) {
          this.isBatched = true;
          this.batchWaitTimeInSec = waitTimeInSec;
          this.batchMaxWaitTimeInSec = maxWaitTimeInSec;
          this.batchThreadPoolExecutor = batchThreadPoolExecutor;
          return this;
      }