I need a shopping cart for selling digital content. The difference is that digital content is user generated so my catalog is constantly changing. Because of this, I took care of the data management and storage myself. All I need is a shopping cart that will automate the process of having a user purchase item X for $y, process the payment, then send back an automated record to my site saying that the item was paid for so I can unlock it for the user. Is E-Junkie able to do this

for me? Thanks.