When you are at the time of booking, you will need to enter or have a valid credit card already available in your account, this will allow you to have the choice to pay in advance by credit card or pay in cash directly to the driver at the end of the service.
I advise you that in any case the system will carry out a pre-authorisation of the amount equal to the cost of the journey. Where you have decided to pay in cash, the pre-authorisation will expire after two days after the service, without any kind of additional cost.