The VMS billing module provides a user-facing interface that allows customers to register accounts, view and update account details, check bills and review past activity. Through the billing system, customers can sign up for email-delivery of bills and activate accounts on PCs, IPTV and mobile devices. The billing system also includes mobile apps that can be downloaded for free and enable customers to purchase from the video store or register for operator service directly from a mobile device. Billing for the app may be managed through Google or iTunes app stores or directly via the billing system.