toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (product != null) 'product': product!,
if (quantityOrdered != null) 'quantityOrdered': quantityOrdered!,
if (returnInfo != null) 'returnInfo': returnInfo!,
if (shippingDetails != null) 'shippingDetails': shippingDetails!,
};