In order to keep up with new networking needs, it becomes necessary to adopt mechanisms for charging network usage in a universal way. The Secure Charging Protocol (SCP) aims at answering this complex authentication, authorization, accounting and charging (AAAC) problem, and provides a view based on a different business model, one that has been adjusted to cope with technological changes. This document discusses SCP as a possible solution to the AAAC problems in MANETs and addresses the improvements made to this protocol in terms of Quality of Service (QoS) and User Interfaces. An implementation of this protocol on PDAs is also described.