Add the feature of fetching domain names and their prices For Whmcs

Hi
Please read the task carefully

I have an extension to register the domain name for whmcs
it works perfectly,
and required to add the feature of fetching the domain name and price

Please review the following documentation to understand how the feature works
https://blog.whmcs.com/133607/feature-spotlight-registrar-tld--pricing-sync
https://developers.whmcs.com/domain-registrars/tld-pricing-sync/
https://docs.whmcs.com/Registrar_TLD_Sync

Api documentation for the system itself
https://www.docs.modulesgarden.com/Domains_Reseller_For_WHMCS#Tips

Attached are files to add namesilo 1 companie that already have this feature
Attached is file 2 of the addition in which I want to add the feature

Personal skills
worked on whmcs before,
php, javascript, mysql, api

The fastest and lowest cost priority is what is required