Within your E-Flux account you'll find bills for your charge card and charge station as well as credit notes.
Go to your E-Flux and log in;
Go to 'My bills' to see an overview of your bills. There are three different kinds of bills:
CPO Usage: subscription costs for charge points.
MSP Usage: subscription- and user dependent costs for charge cards.
CPO Credit: credit notes for the refund of charge point sessions.
Configuring your payment details can be done under your personal details. Click 'Profile & Settings' in the bottom left corner and pick 'Billing' for CPO and MSP invoices and 'Reimbursement Charge Details' for the CPO Credit invoices.