Originally Posted by Shopfranceinc

Be very careful about that ticket machine. If your credit card does not have a chip or a "puce" as the French call it, it won't work. Therefore, be ready to have Euros. You may also use a credit card with the driver, but about half the time, the credit card machines on the buses won't work. I'd just be ready to pay the 9.40 or 9.60 in cash. Also--I recommend you go ahead and buy your roundtrip ticket when you get into Paris. That speeds things up on your return and the drivers are grateful!! The round trip ticket really is just 2 tickets, but it's nice to have. (as long as you don't misplace it!!)