In this post the manual you attached official Google SEO optimization, please review it carefully given that gives several very useful tips for your prestashop store.
This manual was developed initially for internal training of new workers in google but given its very useful Google decided to make it their official guide to optimize your website.
Cash on delivery payment module with surcharge for Prestashop 1.4 and 1.5
Module for Prestashop 1.4 and 1.5 that allows your customers to make payment at the time of receiving the order.
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