Originally Posted by JOUY31

Well, Taxis G7 are supposed to accept credit cards, whether booked through the call center or just taken in the queue at CDG. If they don't and you complain, they can be suspended or lose their G7 affiliation altogether.

The process I have experienced when I take a taxi at CDG and do not book with G7 is as follows:
- ask before boarding if the taxi accepts credit cards
- be told that there are ATMs where you can take cash
- disregard the comment and say that I really want to charge it to a credit card
- ask the next drivers whether they accept credit cards; this usually is not a problem as long as I haven't entered into a shouting match with the first cab driver
.........