The present document is part of a series of documents that specify charging functionality and charging management in 3GPP networks. The 3GPP core network charging architecture and principles are specified in TS 32.240, which provides an umbrella for other charging management TSs that specify:

• the content of the CDRs per domain / subsystem / service (offline charging);
• the content of real-time charging messages per domain / subsystem / service (online charging);
• the functionality of online and offline charging for those domains / subsystems / services;
• the interfaces that are used in the charging framework to transfer the charging information (i.e. CDRs or charging events).

The complete document structure for these TSs is defined in TS 32.240. The present document specifies the offline, online and converged charging description for Northbound Application Program Interfaces (API), based on the functional stage 2 description in TS 23.682 for transaction over T8 reference point between SCEF and SCS/AS and in TS 23.501 for Network Exposure Function (NEF). This charging description includes the offline, online and converged charging architecture and scenarios specific to Northbound Application Program Interfaces (API), as well as the mapping of the common 3GPP charging architecture specified in TS 32.240 onto the Northbound Application Program Interfaces (API). It further specifies the structure and content of the CDRs for offline charging. The present document is related to other 3GPP charging TSs as follows:

• The common 3GPP charging architecture is specified in TS 32.240.
• The parameters, abstract syntax and encoding rules for the CDRs are specified in TS 32.298.
• A transaction based mechanism for the transfer of CDRs within the network is specified in TS 32.295.
• The file based mechanism used to transfer the CDRs from the network to the operator's billing domain (e.g. the billing system or a mediation device) is specified in TS 32.297.
• The 3GPP Diameter application that is used for Northbound Application Program Interfaces (API) offline and online charging is specified in TS 32.299.
• The services, operations and procedures of charging, using Service Based Interface are specified in TS 32.290.
• The charging service of 5G system is specified in TS 32.291.

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

• References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.