toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (brand != null) 'brand': brand!,
if (gtins != null) 'gtins': gtins!,
if (lineItemId != null) 'lineItemId': lineItemId!,
if (mpn != null) 'mpn': mpn!,
if (productId != null) 'productId': productId!,
if (productTitle != null) 'productTitle': productTitle!,
if (quantity != null) 'quantity': quantity!,
};