What is Fedex Pickup number and where can I get it?

Fedex pickup number is the unique code through which Fedex team can identify the shipment and can track the live status of your shipment.

To get the Fedex pickup number, Click on Shipping label--> Copy Value of Origin ID  (For eg value is LUHA)
Go to order copy Fulfillment id under fulfillments: Pickup Confirmation Number (For eg value is 18)
So the pickup number would be LUHA18