You specify the key URL because the internet search engine might have issue deciding which 1 really should be the first URL. The following tutorial will teach you how to allow Canonical URLs in Prestashop 1.5. Hook Overview: This hook permits you to add any added fields or information https://addons.prestashop.com/de/seo-suchmaschinenranking-optimization/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html