Shipping labels
With live shipping rates, vendors print a label directly from the order fulfillment view. Labels are bought from the marketplace's carrier account (Shippo, Easyship or Shipmondo).

Purchase the shipping label
For all orders, vendors have the options buy the shipping rate from Shippo. When the rate is purchased from Shippo, the marketplace receives the shipping costs. The vendor can choose to use their own shipping methods. In that case, the shipping cost goes to the vendors.
First, the vendor packs the item and verifies the shipment details. The vendor measures the dimensions and the weight of the parcel(s). Once done, they can generate shipping rates.

Shipping rates are fetched from the marketplace's carrier account. The rate costs are hidden and the cheapest price is at the top.

Garnet offers the courier service the customer picked at checkout, among the preferred courier services. When that service has no rate anymore, for instance because the parcel changed, every rate of the carrier account is offered.
The label follows the marketplace's duties and taxes setting: with DDP (duties paid), the label includes the duties and taxes, so the customer has nothing more to pay on delivery.
Troubleshoot - Shipping cost not displayed to the vendor
Indeed there is usually a discrepancy between the shipping paid by the customer and the actual shipping cost. For instance, the oil price can fluctuate between the shipping quote (at checkout), and the actual shipping (at fulfillment).
So for each order, the marketplace will either profit or make a loss on the shipping. To limit losses, Garnet offers the same courier service the customer paid for at checkout, so the label cost stays close to the shipping quote.
We do not want vendors to worry about discrepancies: they will try to bypass the marketplace to save a few cents which is a poor vendor experience.
On average, the marketplace profits from live shipping rate.
Refund a label
In case the vendor purchased a rate by mistake, the marketplace can always request a refund on the shipping label on Shippo.