Embodiments of the present invention provide a system and method which overcome the limitations of CAMEL systems which do not natively support reauthorization functionality. The system and method provide a mediation mechanism by which an online charging systems that supports reauthorization functionality can run using the mediation mechanism over CAMEL system. The mediation mechanism provides a means for added user credits to be utilized and allows the user to continue with the activity in which the user was engaged. This is advantageous both to the user and the service provider.