You specify the primary URL as the internet search engine could have difficulty figuring out which a person must be the first URL.  The subsequent tutorial will provide you with ways to enable Canonical URLs in Prestashop 1.5. PrestaShop modules we produced very first to solve the situation of https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html