[fmoses]

Hi,
Google allows for a field for identifier for custom products. I was trying to get utilize this for my custom products:

The below needs to be added as a field if there is no gtin, isbn, mpn, etc.
each item that does not have valid, proper, global-trade-data
(unique-product-identifiers) -- such as handmade items --
must be submitted with an identifier_exists attribute with
an exact value of FALSE

I tried to use this in a new field identifier_exists:
if($data['upc'] == ''){
$field_value = 'false';
}

but I can't seem to get this to work and put false into this field. Any advise, i'm not good with php, but would think there is a simple solution.