The Cobiro Addon for Prestashop will allow you to automatically have a product feed and a continuously updated Google Shopping campaign based on your catalogue of products in your Prestashop store.
To find the Cobiro Addon simply go to the Prestashop Addons Marketplace and search for Cobiro.
Click "Install" to have the module installed on your Prestashop server.
Then click on Cobiro and select "Configure".
Select "New" to register a new email address with Cobiro, or "Existing" to add your Prestashop store to an existing Cobiro user.
Cobiro will automatically begin to import your product catalogue.
Once you have filled in all the required fields to generate your Google Shopping campaigns, the Google Merchant Center and Google Shopping campaigns will be generated.
If the procedure for some reason does not work, store owners who use Prestashop version 1.6 or 1.7 can see in this article by Prestashop how to install the Cobiro Addon manually.