https://access.redhat.com/webassets/avalon/d/red_hat_build_of_keycloak-26/javadocs/org/keycloak/common/crypto/UserIdentityExtractorProvider.html
UserIdentityExtractorProvider (Keycloak Docs Distribution 26.0.17.redhat-00001 API)
declaration: package: org.keycloak.common.crypto, class: UserIdentityExtractorProvider
keycloakdocsdistributionredhatapi