public function approvalRecords(int $startTime, int $endTime, int $nextNumber = null)
    {
        $params = [
            'starttime' => $startTime,
            'endtime' => $endTime,
            'next_spnum' => $nextNumber,
        ];

        return $this->httpPostJson('cgi-bin/corp/getapprovaldata', $params);
    }