[keycloak-user] Spring Boot Multitenancy

Hi, I'm trying to implement multitenant Spring Boot application using Spring Security Adapter. I'm able to authenticate based on path to correct realm. Now I want to protect endpoints based on realm. How can I achieve it? E.g. endpoint /realm/Customer1/users will be accessible only for authenticated user which belongs to realm Customer1 and endpoint /realm/Customer2/users will be accessible only for authenticated user which belongs to realm Customer2? Thanks, Ondrej