I want to set conditional free shipping.

<Setting conditional free shipping>
- You have to set the amount of basic delivery fee and return fee.
- Make sure to set 0 won for initial shipping fee on return. 
- The delivery fee charged to a customer for return is "basic delivery fee+return fee".

<Type of delivery fees>
All the 3 fees are one-way charges. You need to set delivery fee according to delivery fee conditions.  
- Initial shipping fee on return (deliveryChargeOnReturn) : Delivery fee charged to a customer that a seller originally paid for free shipping  
- Return fee (returnCharge) : One-way fee for return
- Basic delivery fee (deliveryCharge) : Fee that a customer has to pay to receive an order for conditional free shipping.

Please refer to below example and set conditional free shipping.  
ex) 10,000 won conditional free shipping 

deliveryChargeType: "CONDITIONAL_FREE",
deliveryCharge: 2500,
freeShipOverAmount: 10000,
deliveryChargeOnReturn:0,
returnCharge:2500