accept authorize bidders buttons customers ebay gateway net page payment products purchase sell software winning

I currently use e-junkie to sell software on eBay. I also use Authorize.net as a payment gateway outside of eBay. I would like to get away from ebay and use my Authorize.net gateway to accept payments from eBay customers. But I still need to use e-junkie. Can this be done?

E-junkie provides you purchase buttons for your products which you can place on a page and ask the winning bidders to purchase the products and make the payment there.