Hi, it would be useful for spanish companies to add support for Virtualname as they sell .es dirt cheap, they have an official whmcs module on github if it can be of help for you: hluaces/virtualname-whmcs: Mirror (under git version control) of the original Virtualname WHMCS module (github.com)
Btw, offtopic but does your system have VAT rules support?
Regards,