An Online Charging System (“OCS”) that processes charging on a telecommunications network receives an indication of usage of a telecommunications service by a subscriber. In response to the indication, the OCS determines a configured offering for the service, where the configured offering includes a time period, and a credit and/or debit. The OCS determines if the usage of the service is a first usage within the time period, and when the usage is the first usage, applies the credit and/or debit. The OCS then determines a charge for the usage based on credit and/or debit.