Hello,
I have 8 years of experience in WHMCS developing addons modules, provisioning modules, hooks and template system changes.
Please check my reviews, I mostly do WHMCS related jobs. I specialise in WHMCS integration.
To complete the task, I need to know few things, like is the Product/Service currently assigned with a module, if so is it open source etc.. Please message me to discuss in detail.
Regards