Canada Post/PayPal online purchase form

We require an online form to be built that can interact with Canada Post using their Sell Online technology to purchase granola and chocolate online ([login to view URL]). Once all of the shipping information is calculated based on the quantity selected, we want the user sent to PayPal to pay for the order. We will be using subscriptions through paypal as well. Before bidding, please ensure that you are comfortable in what we are asking for by reading through the documentation. If you have any questions, please don't hesitate to ask.