An approach for optimizing the rate of delivery of data records required by a billing system associated with a service provider is described. A mediation platform collects session records for specifying data about sessions conducted by network subscribers via the network and transport records for specifying data about the transport of data via the network during a correlation cycle. The mediation platform also generates, based on a minimal threshold of correlation, a charging data record based on a mapping of data associated with a session record and multiple transport records. The mediation platform also transmits the charging data record to a billing system of the provider prior to the collecting of all of the session records and transport records.