Hello,
I have 8 years of experience in development with WHMCS.
I have created many provisioning/server modules, addon modules & registrar modules for WHMCS. I have integrated billing solution for many 3rd party services in WHMCS thorough modules, by connecting over RestAPI.
I follow best practices and standards in coding and produce a clean readable code, using PSR-2 standard.
I use mostly WHMCS inbuilt functions & localAPI calls to extract data from WHMCS, so that the modules will be future proof and works well with php / WHMCS upgrades.
I work with WHMCS template/theme system, Smarty, so that I can make WHMCS theme matching with the main website.
Please do PM, so that we can discuss further.
Please review my freelancer reviews, I most do WHMCS projects. https://www.freelancer.com/u/phpizephing
Regards