code: function(subscription_name) {
      if (Subscriber.prototype.subscriptions[subscription_name]) {
        var sub_id = Subscriber.prototype.subscriptions[subscription_name];
        request.del(this._endpoint, {
            qs: this.unsubscribeParams(sub_id)
          }, function(error, response, body) {
            if (!error && response.statusCode == 200) {
              logger.info('instagram -', subscription_name, 'unsubscribed successfully');
              delete Subscriber.prototype.subscriptions[subscription_name];
            }
          }
        );
      }
    }
docs: Unsubscribe request