code: public function listSubMerchants($beginId = 0, $limit = 50, $status = 'CHECKING')
      {
          $params = [
              'begin_id' => $beginId,
              'limit' => $limit,
              'status' => $status,
          ];
  
          return $this->parseJSON('json', [self::API_LIST_SUB_MERCHANT, $params]);
      }
docs: 批量获取子商户信息.
  
  @param int    $beginId
  @param int    $limit
  @param string $status
  
  @return \EasyWeChat\Support\Collection