Hello,
i'd like to offer you my Prestashop skills. I can fix your issue with OPC module when creating new account. It should take max one hour to fix.
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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