public static String getEmail(final JwtClaims jwtClaims) {
        LOGGER.debug(() -> "Claim value " + OpenId.SCOPE__EMAIL + "=" + jwtClaims.getClaimValue(OpenId.SCOPE__EMAIL));
        return (String) jwtClaims.getClaimValue(OpenId.SCOPE__EMAIL);
    }
Get the JSON Web Signature from the specified request header
stroom-security/stroom-security-common-impl/src/main/java/stroom/security/common/impl/JwtUtil.java