ATM at CDG in terminal 2B

HSBC at the TGV station. https://www.parisaeroport.fr/en/passengers/services/bank-atm

Many people wait to get euros upon arrival. And it may, (or may not depending on fees), be the cheapest way to get cash. We prefer, however, to have currency in hand when we arrive. That eliminates the problems of finding an ATM, waiting in line to use it, hoping it works (the do malfunction from time to time), and doing it while jet lagged, handling luggage, and being on strange turf. You should be able to get a couple of hundred from your local bank or AAA office. That will eliminate the hassles mentioned above and tide you over until you are acclimated. Yes, it will cost a few dollars more to get currency before you leave. But compared to the overall cost of the trip, it's minor. Just something to consider.

I did it one time, and it had some rip off rates. I think you can buy a ticket on RER B to get into the city using a credit card.

There may still be an HSBC ATM in terminal 2, next to Baggages du Monde, but HSBC is closing its retail banking operations in France. Otherwise, there are no other Bank ATMs currently at CDG, where Travelex currently operates all ATMs. The Travelex ATMs charge a fee, I believe it is 3%.

Official taxis are required to take credit cards, and the train kiosks all accept credit cards.

Have been to Paris 3x in the past year. Use a cc to get the train into the city and buy euros there but if not comfortable doing that buy some from your bank at home.

ATM’s work 24 hours a day, 7 days a week, unless they’re being serviced (restocking receipt paper, adding currency, etc.).