Subscribe and unsubscribe links

subscribe-links.html

{% for service in provider.services %}
  <div class="service-column">
      <p>{{ service.name }}</p>
      <p>{{ service.description }}</p>
      {% unless service.subscribed? %}
        <a href="{{ urls.signup }}?{{ service | to_param }}">Signup to {{ service.name }}</a>
      {% endunless %}
  </ div>
{% endfor %}