barcodeLookup method
Looks up product information by barcode.
barcode is the EAN/UPC barcode to look up.
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}) async {
return _productDataSource.barcodeLookup(barcode: barcode, authToken: token);
}