I would also like an answer to this if someone works it out please? My notification template has this in it by default  {% if po_number %}<tr><td><strong>PO number</strong><br/><p>#{{ po_number }}</p></td></tr>{% endif %}

We use a 3rd party payment provider and the only reference to the order is the payment string that it generates. This string is displayed in shopify under the Order in a field called "Payment ID". Is there a way to add this to our email order notific...