Hi,
How can we integrate Checkpoint firewall with SolarWinds NMS, I could not find any document related to this. (Check Point Quantum 6200 Security Gateway )
Depends on what you mean by "integrate". Out of the box you should be able to monitor it via ICMP and if configured via SNMP for interfaces.Beyond that, it's going to be a lot of building Universal Device Pollers (aka UnDP) for specific OIDs. Here's a starter for 10: https://support.solarwinds.com/SuccessCenter/s/article/Create-a-Universal-Device-Poller-UnDP?language=en_US