Ask HN: How does Upromise track my credit card use?

I am trying to get a start up off the ground. I need to track my members credit card use similarly to Upromise to make business plan work. I have tried to contact Upromise, Visa, MasterCard, and a new start up Linkables that tracks CCs but everyone seems pretty closed lipped about it. Does anyone have any ideas how this is done. If you are not familiar with Upromise here is their “how it works” page. http://www.upromise.com/welcome/how-it-works