When a client books one of your events and pays online, there is a checkbox that is checked by default that will save their payment information.
If the clients payment information is saved in your CC account, you may be able to use it on future bookings, however it is your responsibility to acquire consent from your customer to use their saved payment information.
To make a payment on a booking using a client's saved payment method:
Click on the booking you'd like to apply the payment for and click Make Payment.
Select the saved payment method that the client has authorized you to use.
Enter the amount of payment the client has authorized, and click Make Payment.