copyleftconf-website/pinaxcon/templates/registrasion/emails/invoice_created/message.html

{% load i18n %}

{% if invoice.is_unpaid %}
<p><strong>NOTICE:</strong> The below invoice is automatically generated, and will be voided
  if you amend your registration before payment, or if discounts or products contained in the
  invoice become unavailable. The items and discounts are only reserved until
  the invoice due time.</p>

<p>Please ensure this invoice is paid by the due date.</p>

{% endif %}

{% url "invoice" invoice.id invoice.user.attendee.access_code as access_url %}
<p>This invoice is available at <a href="http://{{ current_site }}{{ access_url }}">http://{{ current_site }}{{ access_url }}</a> --
  You can give this URL to your accounts department to pay your registration.
</p>

<hr />

{% include "registrasion/_invoice_details.html" %}