barcodeLookup abstract method
Looks up product information by barcode.
barcode is the EAN/UPC barcode to look up.
authToken is an optional authentication token for the API.
Returns a Response containing the Product information if successful, or an error if the request fails or the product is not found.
Implementation
Future<Response<Product>> barcodeLookup({
required String barcode,
String? authToken,
});