Hello there,
I have read your project detail, you need to resolve a fatal PHP error when submitting an order in the backoffice of a live prestashop website.
We are a 10 year old IT company with highly skilled designers and developers to work on php, Mysql, Jquery, Wordpress, OSC, Magento, OpenCart, prestashop, Mobile development, iPhone, Responsive etc.
It would be better if you come to have a close discussion over chat .
Best Regards
Harpreet Singh