@Override
    public long lifetimeMs() {
        return lifetimeMs;
    }
The token's lifetime, expressed as the number of milliseconds since the
epoch, as per <a href="https://tools.ietf.org/html/rfc6749#section-1.4">RFC
6749 Section 1.4</a>

@return the token's lifetime, expressed as the number of milliseconds since
        the epoch, as per
        <a href="https://tools.ietf.org/html/rfc6749#section-1.4">RFC 6749
        Section 1.4</a>.
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/secured/BasicOAuthBearerToken.java