When your vendor requires specific shipping methods Spark Shipping allows you to map your shopping cart shipping methods (Site Code) to your vendor's shipping methods (Vendor Code).
Vendor -> Update Fulfillment Settings -> Shipping Description Mapping
|Site Code||Vendor Code|
|3 Day Ground||UPS_GRND|
- Shipping Description Mapping is not required for all setups. Only when the vendor requests a specific shipping method(s).