It took me a while to get what the heck a ticker was, but I think I got it now, though it wasn't entirely obvious.
Your program looks nice though. I would not try to monetize this with complicated VISA payments et.c., at least not in the first place.
I would make a goodlooking website and provide the ticker for free, and preferably make the program web-based instead. Then put some ads on this site and perhaps require a link back from those who uses the ticker.
If you really want to take VISA payments, PayPal is a good and easy provider to use, but I'm not sure if they work with subscription based services.