You can ask a friend to request on your behalf. There is no online system. I've spent a year working and studying in China. I was seeking a Police Clearance Certificate for Canada visa. Aofan Consulting would be an option (https://www.intrz.com/en/background-cn/) . 3,000 RMB for Shanghai, Other cities may a little higher. They got the papers in the time frame they've promised, they were super professional. They have pretty good rates in comparison with other firms.
