...
Service Manager is a Go implementation of the CAPIF Core function, which is based on the 3GPP TS "29.222 Common API Framework for 3GPP Northbound APIs (CAPIF)" interfaces, see Technical Specification https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3450.To To see the APIs in Swagger format, see https://github.com/jdegre/5GC_APIs/tree/Rel-17#common-api-framework-capif.
The CAPIF APIs are generated from the OpenAPI specifications provided by 3GPP. The generate.sh script downloads the specifications from 3GPP, fixes them and then generates the Go code to work with the APIs.
...