Some modifications on Drupal / Ubercart E-Commerce Website

We are an online store selling car parts. Our website was designed using Drupal / Ubercart and is currently up and running. We need to make some changes. 1) Integrate the inventory in our warehouse system with the websites inventory through the API provided by our warehouse: our system should take the current stock level from our warehouse system and show as the correct one. 2) After integrating point 1) we need to add a stock status indication on each product page (green for "in stock", red for "out of stock"). 3) Purchase orders: for every product we need to assign a "Supplier" so that we can be able to generate a report afterwards (filtering by supplier) in order to create Purchase Orders. The purchase order shall be generated automatically by comparing current stock status and the desired (max) stock level. The difference should be the quantity that needs to be ordered. Thats it. Just show the report so we can copy and past on an email later on. Our website is [login to view URL] We look forward to your offers. Thank you.