Parallels Plesk Billing

The Parallels Plesk Billing software package is a commercial web hosting billing and automation program. Originally released under the U.S. company ModernGigabyte, LLC and designed in Louisville, KY, 
Parallels Plesk Billing became a Parallels, Inc. product when Parallels, Inc. acquired ModernGigabyte, LLC in January 2008. Originally called ModernBill, the product's name was changed to Parallels Plesk Billing as part of an overall rebranding of the company's products.
Overview.
Parallels Plesk Billing allows a server administrator to acquire, provision, manage and recurringly bill orders for services requested from end customers with a particular emphasis on domain registration, web hosting, digital certificates and other web-based services and applications. Parallels Plesk Billing integrates through an API with many third party systems like control panels, domain registrars, payment gateways, and other service providers. Other features include support for template based plans, upgrade/grade options, ala carte resource additions, and suspension/re-enablement based on payment history.
Parallels Plesk Billing utilizes a MySQLl database running on PHP 5.x or better. Parallels Plesk Billing can be installed on any Windows, Linux, or FreeBSD operating system that supports Apache server or Internet Information Services. .