code: public SubscriptionResponse deleteAllSubscription() throws InstagramException {
          final OAuthRequest request = prepareOAuthRequest(Verbs.DELETE);
  		request.addQuerystringParameter(Constants.SUBSCRIPTION_TYPE, "all");
  
          try {
              final Response response = request.send();
              return getSubscriptionResponse(response.getBody());
          } catch (IOException e) {
              throw new InstagramException("Failed to delete all subscriptions", e);
          }
  	}
docs: Deletes all the known subscription.
  
  @return the response of this request, holding mainly the code