code: public Boolean getFinalMasterTransStatus() {
  		if(finalMasterTransStatus == null){
  			//check by logs first
  			finalMasterTransStatus = checkTransStatusByLogs();
  			
  			//then check by API
  			if(finalMasterTransStatus == null){
  				finalMasterTransStatus = transStatusChecker.checkTransactionStatus(getLogCollection().getAppId(),getLogCollection().getBusCode(), getLogCollection().getTrxId());
  			}
  		}
  		return finalMasterTransStatus;
  	}
docs: status true for commit,false for roll back,null for unknown
  @return