The canonical module adds the tag link in the header to avoid duplicate content, because products for combination products may have different url with same content, like the pages of categories.
Google, if you do not know the main index a page can not be the one we want. Adding this link and this attribute allows owners of websites to identify pages with identical content and suggest to Google's page deemed most useful and which should be given priority in search results among all pages including the same content.
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Support and review of incidents
In case you have problems with a module, 4webs agrees to locate the problem provided it is for reasons attributable to our modules, 4webs not make adjustments for customer need or incompatibilities with other modules.
How can support on the modules?
4webs not responsible for any problems you may have a bad user configuration settings or manipulation of Prestashop hosting.
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The purchase of any module includes email support and updates for 90 days in the domain that will be used.