ISPmanager integration doesnt working

The developers said that everything is ok on their side, the control panel sends requests, but cloudflare does not send anything in response and does not add sites

Can you provide more detail? What is the ISP Manger integration? What are you trying to do with it? Are you getting an error from Cloudflare?

Try to find more details of communications between Cloudflare and ispmanager in /usr/local/mgr5/var/ispmgr.log file.