Npcf_PolicyAuthorization
The Npcf_PolicyAuthorization Service, as defined in 3GPP TS 23.502 [3] and in 3GPP TS 23.503 [4], is provided by the Policy Control Function (PCF).
The Npcf_PolicyAuthorization service authorises an AF request and creates policies as requested by the authorised NF service consumer for the PDU session to which the AF session is bound to. This service allows the NF service consumer to subscribe/unsubscribe to the notification of events (for example, Access Type and RAT type, PLMN identifier, access network information, usage report).
Reference: 3GPP TS 29.514 V15.4.0