Digital Access Pass 1click Upsell and Kunaki

I am building a membership website for a client using digitalaccess pass: [login to view URL] We want to use the 1 click upsell feature to allow site users to 1st sign up for a membership account and then are offered an upsell of the membership on a DVD. My client has requested me to use: [login to view URL] as the service that send the DVD to the user if ordered. My issue is that I do not know how to integrate the Kunaki XML service that will send the variables from the order to be fulfilled. Here is the documentation: [login to view URL] Please have a look at this before bidding. Also we are going to use either [login to view URL] as the checkout software or paypal, whatever is the eiser one to intergrate with Kunaki. Here is the flow: User lands on sales page user clicks "buynow" they are taken to the checkout page where the fill in all there information. the user clicks ok customers through after the original transaction is processed. Customers can proceed with offers with just one click—no need to reenter payment and shipping information. this is where we will need to sen the XML data to Kuniki website for fufillment. As the documentation is on the Kunaki website this whould not be a tough job. I will set up the shopping cart software.