Hello,
i'd like to offer you my Prestashop skills. I can help you modify your PDF invoice. I expect all your changes would take around 3 hours of work.
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I work daily with prestashop over 7 years. I know prestashop from top to bottom. I am familiar with every aspect of this eshop system. From adding simple features, theme modifications, creating custom prestashop modules to overriding core files and connecting prestashop to various API's.
Thank you for your time.
Kind Regards,
Jarda Nalezny