protected String extractAccessTokenFrom(final String token) {
        return OAuth20JwtAccessTokenEncoder.toDecodableCipher(accessTokenJwtBuilder).decode(token);
    }
This is {@link BaseUmaTokenAuthenticator}.

@author Misagh Moayyed
@since 6.0.0
support/cas-server-support-oauth-uma-core/src/main/java/org/apereo/cas/uma/web/authn/BaseUmaTokenAuthenticator.java