IMO this comment is highly exagerated and hardly helpful to people seeking balanced information. You can use credit cards all over Brazil, in hotels, restaurants and most shops. I have lived here for more than 20 years and the only time I had fraud on my credit card was on a business trip to Los Angeles.....Credit card fraud exists all over the world and is certainly not worse in Brazil than in many other places. It is much more dangerous to walk around with a lot of cash.