if (signType == null) {
        if (result.getSignType() != null) {
          // 如果解析的通知对象中signType有值，则使用它进行验签
          signType = result.getSignType();
        } else if (configMap.get(result.getMchId()).getSignType() != null) {
          // 如果配置中signType有值，则使用它进行验签
          signType = configMap.get(result.getMchId()).getSignType();
          this.switchover(result.getMchId(), result.getAppid());
        }
      }

  private String getConfigKey(String mchId, String appId) {
    return mchId + "_" + appId;
  }