WHMCS reseller module
Add files to modules/servers/dedimax folder.
You need to crearte new product Configurable Option for your product called "Operating System"
Option name should be same as Cloud OS names in: https://api3.dedimax.com/api/3.0/cloud/templates
Same for dedicated server just URL is: https://api3.dedimax.com/api/3.0/dedicatedserver/plan/3/os Replace 3 with your selected product plan.