code: public Subscription updateSubscriptionPreview(final String uuid, final SubscriptionUpdate subscriptionUpdate) {
          return doPOST(Subscriptions.SUBSCRIPTIONS_RESOURCE
                        + "/" + uuid + "/preview",
                        subscriptionUpdate,
                        Subscription.class);
      }
docs: Preview an update to a particular {@link Subscription} by it's UUID
  <p>
  Returns information about a single subscription.
  
  @param uuid UUID of the subscription to preview an update for
  @return Subscription the updated subscription preview