Markup is usually easily checked by way of schema markup testing Instrument. It will require some time for rich snippets to look in search engine results, so they is probably not shown instantly. Even so, product and class rich snippets will appear only right after Google indexes the written content. https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html