Hello, I'd like to offer you my Prestashop skills.
I can fix your add to cart issue right away. All I need is a ftp or hosting administration access to your shop.
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I work daily with Prestashop for over 8 years. I know Prestashop from top to bottom. I am familiar with every aspect of this e-commerce platform. From adding simple features, theme modifications, creating custom Prestashop modules to overriding core files or connecting Prestashop to various APIs.
Thank you for your time.
Kind Regards,
Jarda Nalezny