@Override
    public Optional<String> getUsernameForUserHandle(final ByteArray userHandle) {
        return getRegistrationsByUserHandle(userHandle).stream().findAny().map(CredentialRegistration::getUsername);
    }
This is {@link BaseWebAuthnCredentialRepository}.

@author Misagh Moayyed
@since 6.3.0
support/cas-server-support-webauthn-core/src/main/java/org/apereo/cas/webauthn/storage/BaseWebAuthnCredentialRepository.java