public final Object rawClaim(String claimName) {
        return claims().get(Objects.requireNonNull(claimName));
    }
Extract a claim in its raw form

@param claimName
           the mandatory JWT claim name
@return the raw claim value, if it exists, otherwise null
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/unsecured/OAuthBearerUnsecuredJws.java