Hello,
I would like to offer you my prestashop skills. I am able to fix for you all 3 points.
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I work daily with prestashop over 5 years. I know prestashop from top to bottom. I am familiar with every aspect of this eshop system. Prestashop settings, tweaking, modifiing core and theme files, custom module development etc.
You can also check many of my positive reviews here on freelancer.
Thank you for your time.
Best Regards,
Jarda