public OpenIdTokenRequestHelper addScope(final String scope) {
        if (scopes == null) {
            scopes = new ArrayList<>();
        }
        this.scopes.add(scope);
        return this;
    }
Allows you do define client credentials that differ from those in {@link OpenIdConfiguration}
stroom-security/stroom-security-common-impl/src/main/java/stroom/security/common/impl/OpenIdTokenRequestHelper.java