Windows Shipping Application Need Developed

We need a windows application created that is a shipping program. Basically it will be able to print out multiple orders shipping labels. It needs to work with 20-30 ecommerce platforms as well as paypal and ebay. It will be able to connect to endicia, stamps, ups, fedex, etc in order to print the labels out. It should also be able to send a tracking number email from the ecommerce platform, or ebay, paypal platform. We will provide the design for it, however we need someone to create a mac osx program out of it. Thankyou, message me if you have any questions. Please show applications for windows that you have created before.