Magento calling fedex webservice for rates

[Ash_Marsh]

Does anyone know what object Magento expects/receives when calling the FedEx Rates webservice? As I am trying to create an API to be the "middleman"  between Magento and FedEx (so that i can add 8% to the overall price of a shipment).

Thanks!  

[Dmitry_Fedyuk]

How does the Fedex module request the carrier API: https://mage2.pro/t/475