Abstract: Authorizing a billing by a billing system of a telephone network, to a subscriber, for a service requested over the Internet, using a calling card. A line information database is accessed to obtain the telephone number corresponding to the calling card identifier, and the service is billed to that number. This puts existing telephone billing system and calling card infrastructure to a new use and provides a payment or authorization method that is easy to use and to deploy and bring to market on a large scale.