fulfillmentStartInstructions.shippingStep.shippingCarrierCode is documented as an "occurrence: Always" field but is not returned from the call. I require this information for my app.
ShippingCarrierCode field is returned if available.
Please check that ShippingCarrier details is added to the order either via the UI or the API call.
Once you add the ShippingCarrier details, you will be able to get these information in the GetOrders API response.
Best Regards ,
eBay Developer Support
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