Oscommerce amazon checkout implemention with other changes

Hi I need some new module integration to my highly modified oscommerce store. Below are the enhancement i am looking for. 1. Amazon checkout Implementation a. Inline Implementation b. Order Api Implementation 2. Weight based shipping Implementation for multiple countries 3. Multiple Shipping option a. AM/PM Shipping b. Expedited Shipping c. Specific day Delivery 4. Adding multiple products to shopping basket. Means when clicking on the add to cart button, product will be added to the shopping cart and a popup window will be open to give msg that your product is added to the cart. and we remain on the same page from where product is being added to the cart. right now it is going to the shopping cart page. Only experience programmer can bid those have experience of similar work. Please show me this type of work if you have done before. Looking forward to the bid. Thanks