script.liquid

{% comment %}
  An opinion about option order
  {{ options.email_subject__required }}
  {{ options.order_name_column__required }}
  {{ options.prepend_pound_sign_to_order_name__boolean }}
  {{ options.shipping_cost_column__required }}
{% endcomment %}

{% assign updates = array %}

{% if event.preview %}
  {% assign update = hash %}
  {% assign update["name"] = "#1234" %}
  {% assign update["shipping_cost"] = 1.23 %}
  {% assign updates[updates.size] = update %}
  {% assign email = hash %}
  {% assign email["subject"] = options.email_subject__required %}
{% endif %}

{% if email.subject == options.email_subject__required %}
  {% for attachment in email.attachments %}
    {% assign shipments = attachment.content | decode_base64 | parse_csv: headers: true %}
      {% for shipment in shipments %}
        {% assign order_name = shipment[options.order_name_column__required] %}
        {% assign shipping_cost = shipment[options.shipping_cost_column__required] %}

        {% if order_name != blank %}
          {% if options.prepend_pound_sign_to_order_name__boolean %}
            {% assign order_name = order_name | prepend: "#" %}
          {% endif %}
          {% assign update = hash %}
          {% assign update["name"] = order_name %}
          {% assign update["shipping_cost"] = shipping_cost %}  
          {% assign updates[updates.size] = update %}
        {% endif %}

      {% endfor %}
  {% endfor %}
{% endif %}

{% if updates != empty %}
  {% action "report_toaster" %}
    {
      "operation": "update",
      "Order": {{ updates | json }}
    }
  {% endaction %}
{% endif %}