Quote Originally Posted by Shedder View Post
Just tried this.

1. Added the Numinix Product Fields mod (added only upc_isbn from the optional fields).

2. Turned 'UPC/ISBN/EAN' to true in the Merchant Center Feeder config.

3. Opened the first product and added the word "test" into the new UPC, ISBN, EAN & ASIN fields, and saved it (already have "test" in the 'Products model' field).

4. Ran the feeder

The result has only the following within the output...
<g:mpn>test</g:mpn>
<g:upc>test</g:upc>

Reading Google's requirements, they need 2 out of <g:brand>, <g:gtin> and <g:mpn>. I'm only ticking one of the boxes so far. Do they accept <g:upc> instead of <g:gtin>?

I can say that my provided isbn numbers shows up in the gtin field in my google merchant account when viewing a product containing an isbn. You may find that your upc number also falls in the gtin field.

I sell mostly vintage and did get an exemption from google but I provide required info when it's available. I have a couple of books that have both a upc and isbn. I tried to provide both numbers but the feeder would only include the upc if both fields were filled in. That's how it works. So if you try to provide both numbers you know what to expect.