Add dynamic link to receipt

{% block messaging %}
    {{ parent() }}
    <!-- customized link message -->
    {% set has_download = false %}
    {% set download_url = 'http://www.yourdownloadlinkhere.com/' %}
        {% for item in items %}
            {% if item.category == 'Your download category here' %}
                {% set has_download = true %}
                {% set download_url = download_url ~ 'linktofile' ~ item.code ~ '.zip' %}
            {% endif %}
        {% endfor %}
        {% if has_download %}
            <div id="fc-messages" class="fc-receipt__section">
                <div class="fc-alert fc-alert--success">
                    <a href="{{ download_url }}">Download your records</a>
                </div>
            </div>
         {% endif %}
    <!-- /customized link message -->
{% endblock %}