Show serials to buyers

Serial Trail writes the complete current assignment to two Shopify order metafields after a successful real fulfillment: a machine-readable JSON value and a Liquid-friendly text value.

Packing slip snippet

In Shopify admin, open Settings → Shipping and delivery → Packing slips → Edit and place this where the serials should appear:

{% assign serials = order.metafields.serial_trail.units_text.value %}
{% if serials != blank %}
  <h3>Serial numbers</h3>
  <div style="white-space: pre-line">{{ serials }}</div>
{% endif %}

Shipping notification snippet

Open Settings → Notifications → Customer notifications → Shipping confirmation and add:

{% assign serials = order.metafields.serial_trail.units_text.value %}
{% if serials != blank %}
  <h3>Serial numbers for this shipment</h3>
  <p style="white-space: pre-line">{{ serials }}</p>
{% endif %}

Verify safely

Use a test order with a real non-demo serial, fulfill it, and confirm the order metafield before sending the notification. Home marks the buyer-display setup step complete after the first successful non-empty platform write.