Wow! This is bad. Really bad. According to this, Blippy unwrapped users credit card numbers | White Hat News, “it was found with a Google search, Blippy leaked a lot of users credit card numbers, the data actually can see the HTML source code directly, the current official has the problem and quickly fixed the same, at least there are four currently known to be affected customers”.
As in this!
If you are using blippy.com, find out if your card was leaked. And generally speaking, be reluctant to share too much personal or financial information on web sites.