Markup might be conveniently checked by using schema markup testing Resource. It will take some time for rich snippets to seem in search results, in order that they will not be shown promptly. Even so, product and group rich snippets will show up only immediately after Google indexes the material. https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html