Prestashop Expert Required Urgent -- 3

We have a webshop, Pretty much prestashop 1.6.1.1 standard with the default-bootstrap theme. We need to correct issues in the theme and core files and modules to make it look nicer and behave the way we like in certain areas including: shopping cart checkout experience payment module(s) behavior and theme alignment Extensions to the address, cart & order data model, including exposing additional data in the webservices available for external integration. product category theme fixes. fixes to product stock functionality (we use simple stock quantities) and complex products (packs) combined. Fixes to core behavior on order state-model changes. Everything done through use of overrides or similar non-intrusive work, the ensure upgradeability for our webshop in the future. Everything need to support localization (multiple languages) read the additional Document which contains much more detailed information.