You already use the strong integration Api to update order information, we already place every item on our scale to weigh the shipment.
How about having an option so that if the shipment is for a single sku, the actual shipping weight can be sent back to Amazon to update the shipping weight field for that product? Many listings at Amazon are a guess for shipping weight, but this would replace that guess with a real, confirmed weight including packaging.
I would love it if it would update my Big Commerce item weight as well.