Doco on Subscription Manager Service for IAS tenants

[nickcantstop]

https://cap.cloud.sap/docs/guides/security/authorization#use-ams-as-authorization-management-system-on-sap-btp The page above suggests to use AMS for new application builds, i am looking for some expansion on that doco as the page below refers to a SAP BTP Subscription Manager Service for IAS tenants that is available for a Multi-tenant Java application, but i cannot seem to find it referenced anywhere else.

https://cap.cloud.sap/docs/java/multitenancy#setup-overview