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