Some organizers allow participants to update the payment method themselves.
This feature can be enabled by the administrators here:
Overview => Settings => Manage Payment Options
Scroll down to the option "Payment Mode Update by Users" to change the setting.
If you enable this option, users can select "Enter or Edit Your Payment Details" on their overview screen (see image 1).
Here the participants can select among the available payment methods (see image 2 as an example).
After saving the settings, they see the new option / details on the overview screen.