toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (fullChargeReturnShippingCost != null)
'fullChargeReturnShippingCost': fullChargeReturnShippingCost!,
if (operationId != null) 'operationId': operationId!,
if (refundShippingFee != null) 'refundShippingFee': refundShippingFee!,
if (returnItems != null) 'returnItems': returnItems!,
};