Yes! Both the WHM control panel and the free domain reseller account have a powerful API that allows all kinds of automation with 3rd party billing / management platforms. The most common of these being WHMCS. We provide clients on the platinum level reseller plan with a Free WHMCS license but clients on lesser plans can still use WHMCS. Using WHMCS along with our domain reseller account and WHM control panel allows you to automate every aspect of your web hosting business including taking orders, issuing invoices, marking invoices as paid/unpaid, registering domains for clients, setting up hosting accounts, suspending or terminating hosting accounts, providing a support desk for your clients and much much more besides.