No global identifier provided (e.g., gtin, mpn, isbn)

Hi Todd,

Thank you for your response, however, as I said originally, while the code adds to the $markup array, it has no effect on what is output to the ld+json script and thus Google Search Console is blind to it.

I’m still seeing:
<script type="application/ld+json">[{"@context":"https:\/\/schema.org\/","@type":"Product","sku":"978-0-9876451-0-4","name":"The Cheeky Possum","description":"A soft cover A4 landscape illustrated children's story about a possum who enjoys scaring people in the night time.\u00a0 Contains a dozen beautifully illustrated double page spreads of story and pictures.","releaseDate":"2018-03-29T10:42:24+11:00","brand":{"@type":"Thing","name":"Data Stream Pty Limited"},"url":"http:\/\/10.0.1.2\/child\/the-cheeky-possum\/","category":"Book Publisher","weight":{"@type":"QuantitativeValue","unitCode":"GRM","value":"180"},"height":{"@type":"QuantitativeValue","unitCode":"CMT","value":".4"},"width":{"@type":"QuantitativeValue","unitCode":"CMT","value":"30"},"depth":{"@type":"QuantitativeValue","unitCode":"CMT","value":"21"},"image":{"@type":"ImageObject","url":"http:\/\/10.0.1.2\/child\/wp-content\/uploads\/2018\/03\/CheekyPossum-cover.jpg","width":1123,"height":794},"aggregateRating":{"@type":"AggregateRating","ratingValue":"5.00","bestRating":"5","ratingCount":1,"reviewCount":1},"review":[{"@type":"Review","@id":"http:\/\/10.0.1.2\/child\/the-cheeky-possum\/#li-comment-499","description":"Delightful children's picture and story book. Full of light and shadow.","datePublished":"2019-10-03 10:18:17","reviewRating":{"@type":"Rating","ratingValue":5},"author":{"@type":"Person","name":"Barry Brunning","url":""}}],"offers":{"@type":"Offer","price":"15.00","priceCurrency":"AUD","availability":"https:\/\/schema.org\/InStock","itemCondition":"NewCondition","seller":{"@type":"Organization","@id":"http:\/\/10.0.1.2\/child\/","name":"Data Stream Pty Limited","url":"http:\/\/10.0.1.2\/child","logo":"http:\/\/10.0.1.2\/child\/wp-content\/uploads\/2018\/03\/DSdelta.png"},"url":"http:\/\/10.0.1.2\/child\/the-cheeky-possum\/","priceValidUntil":""},"additionalProperty":[{"@type":"PropertyValue","name":"pa_isbn","value":"978-0-9876451-0-4"},{"@type":"PropertyValue","name":"pa_publisher","value":"Data Stream Pty Limited"},{"@type":"PropertyValue","name":"pa_illustrator","value":"Paige Tilley, Rhiannon Tilley"},{"@type":"PropertyValue","name":"pa_seller","value":"Data Stream Pty Limited"},{"@type":"PropertyValue","name":"pa_seller_abn","value":"25 001 659 178"}]}]</script>
with no sign of “gtin”.

I have cleared the browser cache and as you will see this is a localhost test, so there’s no Cloudflare or hosting caches to confuse the issue.

Maybe Rank Math is looking at $markup before the filter executes?

I even tried replacing $markup[‘sku’] with $markup[‘gtin’] in case some array structure assumptions were being made (although I’m sure Rank Math developers do not commit such sins 😊). I’m confident in what I’ve done to $markup because I’ve checked the variable in phpStorm debugging mode.

Best regards,
Barry

Hello Once More Todd,

Oh dear!, Should have checked with the Google Structured Data Testing Tool before shouting Eureka. It’s more unhappy than ever and now has three warnings:

warningbrand	
The brand field is recommended. Please provide a value if available.
warningsku	
The sku field is recommended. Please provide a value if available.
warning	
This Product is missing a global identifier (e.g. isbn, mpn or gtin8). Please see documentation for valid identifiers.

1. I’ll look into why we’ve lost brand in the update, maybe just needs re-selecting.
2. ‘sku’ I can put back, so no problem there. As I said I’d replaced it with ‘gtin’.
3. Although ‘gtin’ is mentioned in schema.org, maybe I need ‘isbn’? Will research further.

When I’ve found out more I’ll raise a new ticket if necessary.

Never easy.

Best regards,
Barry

Hello Michael,

Thank you to you, Todd and all your colleagues at Rank Math for perseverance with this issue. It is appreciated.

I will follow the advice you’ve given, however, we have now arrived at the holiday season with family arriving today from all parts and for the present that becomes my priority. Hopefully, you will indulge me if I return to this after a short break.

I see from the screen shot that you have a ‘Ticket Resolution’ prompt that I as a user don’t see? Maybe this ticket should revert to ‘not resolved’?

Thank you again,
Barry

Hello,

I have updated the sensitive data as requested. Can you please check further?

Thank you.

Hello Michael,

Well the fix didn’t work initially. There was no ‘gtin13’ property manifesting in <script type=”application/ld+json”> on the product page. So I wondered about:
if(isset($entity['isRelatedTo']))
and decided I couldn’t see why it would be set. So now I have:

/**
 * Filter to modify schema data.
 *
 * @param array $entity Snippet Data
 * @return array
 */
add_filter( 'rank_math/snippet/rich_snippet_product_entity', function( $entity ) {
   
	$entity['gtin13'] = str_replace('-', '',$entity['sku']);
	$entity['offers']['priceValidUntil'] = '2020-12-31';
	return $entity;
});

which works fine. I’ve extracted the script data from the page and it passes in the Google Structured Data Testing Tool. Terrific.

And thank you for the ‘priceValidUntil’ property. WooCommerce only populates this with a sale price and we don’t have sale prices, so that’s an excellent solution for us.

RankMath’s support has been diligent. Thank you.
Barry