public function suspend($code = null)
    {
        if (! $code) {
            $code = $this->data->code;
        }

        $response = $this->client->put('/{code}/suspend', [$code]);

        if (! $response->hasErrors()) {
            $this->event->dispatch('SUBSCRIPTION.SUSPENDED', new SubscriptionsEvent($this->data));
        }

        return $this;
    }