Hello,
i'd like to offer you my prestashop skills. I can modify your prestashop and export module so you will be able to control which products will be presented in XML.
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I work daily with prestashop over 6 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