We’ve all seen, “sorry, invalid credit card number”on the screen when ordering educational materials online, but how did they know?
Thanks for visiting Consumerist.com. As of October 2017, Consumerist is no longer producing new content, but feel free to browse through our archives. Here you can find 12 years worth of articles on everything from how to avoid dodgy scams to writing an effective complaint letter. Check out some of our greatest hits below, explore the categories listed on the left-hand side of the page, or head to CR.org for ratings, reviews, and consumer news.
We’ve all seen, “sorry, invalid credit card number”on the screen when ordering educational materials online, but how did they know?
Part of 
Founded in 2005, Consumerist® is an independent source of consumer news and information published by Consumer Reports.