Source: using the service every month. In the beginning, you would pay the driver in person. After a while, they added the option to pay on the site directly,

Source: using the service every month. In the beginning, you would pay the driver in person. After a while, they added the option to pay on the site directly, with a fee (or perhaps without, I can't remember). Lately (a few years ago, can't recall the exact moment), this is the only available payement option. You cannot book a trip without paying via credit card, at least in France.