toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (etags != null) 'etags': etags!,
if (kind != null) 'kind': kind!,
if (productId != null) 'productId': productId!,
if (productName != null) 'productName': productName!,
if (selfLink != null) 'selfLink': selfLink!,
if (skuId != null) 'skuId': skuId!,
if (skuName != null) 'skuName': skuName!,
if (userId != null) 'userId': userId!,
};