Packing Slip Order "Additional details" Fields

[harpstcg]

Hello,

I am using the Shopify Marketplace Connect app to sync my eBay orders to my Shopify. This works great, but my main issue is the packing slips do not have any details from eBay. I wanted to update my packing slip to contain the eBay order id in place of the Shopify order id, however, I cannot figure out how to do this.

When I click into an order on shopify it has a field called "eBay Order Id" under "Additional details". I have tried printing all the attributes that show up there in many different ways from other posts here but none of them show anything. Here is what I currently added to try and show these extra fields:

<p>Test:</p>
{% for order_attribute in order.attributes %}
<div>
{{ order_attribute|first }}: {{ order_attribute|last }}
</div>
{% endfor %}
<p>Test 2:</p>
{% for cart_attribute in cart.attributes %}
<div>
{{ cart_attribute|first }}: {{ cart_attribute|last }}
</div>
{% endfor %}
<p>Test 3:</p>
{% for attribute in attributes %}
<div>
{{ attribute|first }}: {{ attribute|last }}
</div>
{% endfor %}

Every single option from all 3 tests do not print any attributes even though there are attributes on the order:

How can I access the Additional detail information on the packing slips?