The best place to start if you need help with a specific product is to contact the developer. All WHMCS Marketplace developers have both a website and support URL listed.
Resell VPS & Cloud Dedicated Products from Liquid Web
Integrate manager for Hetzner Dedicated
Now you can sell our SSL and security products using WHMCS
AI-Powered Integration of Data Protection and Cybersecurity.
Teamspeak / TeaSpeak server provisioning addon