display stamped.io ranking in woocomerce schema

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention.

Please try using this filter to integrate the Stamped.io reviews into your products:

add_filter( 'rank_math/snippet/rich_snippet_product_entity', function( $entity ) {
    $stampedDBData = get_post_meta(get_queried_object_id(), 'stamped_io_product_reviews_new', true);

    if( isset($stampedDBData) ) {
        $entity['aggregateRating']['@type'] = "AggregateRating";
        $entity['aggregateRating']['ratingValue'] = $stampedDBData['rating'];
        $entity['aggregateRating']['ratingCount'] = $stampedDBData['count'];
    }

    return $entity;
});

The filter should be added to your active theme’s functions.php file. Here’s another way to apply the filter using the rankmath.php file:
https://rankmath.com/kb/filters-hooks-api-developer/#adding-filters-and-hooks-in-rank-math-php

Once done, clear your website’s cache and you can validate the page using Google’s Rich Results test tool.

I hope that helps.

Thank you.