Hi Zeeshan,
Mainly, our item is a WordPress Theme and we have just provided WHMCS template for FREE of cost with our WordPress Theme by customizing WHMCS default six template’s header, footer, and color based on our Theme.
In this case, you need to use both WordPress Theme and WHMCS templates separately. WordPress Theme to show/represent your products/services and WHMCS template for billing like as our demo.
WHMCS Template included in the “whmcs-template” (folder) with the installation instruction “readme.txt”
On the other hand, you could use the WHMCS Bridge plugin to integrate the WHMCS into WordPress.
Please watch this video tutorial https://www.youtube.com/watch?v=5Vr9FziRBec&list=PLbmIKrgYlRboMwt4YWKdt4sHvKu680w3U&index=9&t=0s
Best Regards,
ThemeLooks Support Team