Invalid value in field “priceSpecification” (in “offers”)

Hello,

Thanks for contacting us, and sorry for any inconvenience that might have been caused due to that.

This actually a bug coming from Google itself and they seem to have rolled out a fix already:

https://support.google.com/webmasters/thread/179252156/i-am-getting-error-in-my-merchant-listing-which-says-missing-field-pricetype?hl=en

If you wish to completely remove the priceSpecification that is causing the issue, you may refer to this filter code:

add_filter( 'rank_math/snippet/rich_snippet_product_entity', function( $entity ) {
        unset($entity['offers']['priceSpecification']);
	return $entity;
});

The filter can 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

Hope that helps, and please do not hesitate to let us know if you need our assistance with anything else.

Thank you.