A web service interface defined for a billing service, comprising a plurality of application programming interfaces, where each application programming interface is associated with a billing function provided by the billing service, where each of the application programming interfaces can be implemented such that the billing function associated therewith is performed after a web service invocation that commands performance of that billing function is received by the web service interface. The web service interface is used to provide the billing service as a web service to computing applications in a distributed network environment.