OS Commerce Shopping Cart Integration

[login to view URL] requires the current basket replacing with a new basket to integrate into Secure Trading payment processing. Only 3 or 4 products (ability to add more if required), multi currency payments options, admin for product and exchange rate. Please review the above sites current shopping procedure prior to bidding so that you understand what is required. We are looking for the site to stay exactly as it is but with 2 new products and the new basket with the new features. There will also be the requirement to alter pages that are used on the payment provider side so that customers paying in US $ or Euros for example sees the price in US $ or Euros prior to making secure payment. Any questions please ask.