Some of the items within our store (product type = "stock" or "stock-resource") are stored within a third-party-logistics service (3PL). Picking and packing fees need to be added to these items at the checkout:
$3.20 per order
$0.45 per item
No shipping apps are used or shipping services enabled.
Please let me know your rates.
this task is fairly easy using the app called BESPOKE but you need to enable CCS before. their support is also great and will reply in a timely manner.
I have check your post for detail mentioned and have 5+year's of experience can help you with current expectation.
Let me know your available time and I will do my best to accommodate it.
We can discuss further on email - firstname.lastname@example.org
Please let me know your interest
After a short consultation with two developers it appears that there is no elegant way to add-in a pick and pack fee as the Checkout within Shopify is not customisable.
Thus, I have estimated and added-in the pick and pack fee into the shipping fee.
Attached is the solution I was hoping for.