1. A WAP charging gateway for providing transaction-based billing for WAP services from transaction data written to a billing log file in connection with provision of billable WAP services to a user, said gateway comprising: a reader for reading the transaction data from the billing log file; a converter for converting the read transaction data from the billing log file into an alternate readable form; first rules applyable against the converted transaction data for generating and storing predefined transaction parameters based on the converted transaction data; and second rules applyable against the stored transaction parameters for generating, from the stored transaction parameters, chargeable transactions for use in preparing transaction-based bills for the WAP services.