Section: 5.2.3.3.4 Nudm_SDM_Subscribe service operation
Content: Service operation name: Nudm_SDM_Subscribe Description: The NF consumer subscribes for updates to Subscription Data indicated by the 'subscription data type' input. The UDM shall check the requested consumer is authorized to subscribe to requested updates. Inputs, Required: Subscription data type(s), Key for each Subscription data type(s). Inputs, Optional: Data Sub Key(s), Immediate Report Indication, Disaster Roaming Indicator indicating that Disaster Roaming service is applied. Outputs, Required: None. Outputs, Optional: Subscription Data.