Topping up your Centi payments app is also possible via bank transfer which is clearly the most affordable method. You will have to wait some days for the bank payment to clear, however. Just choose the IBAN method from the top-up menu and follow the on screen instructions.
Do you have additional questions? Check our knowledge-base here https://centi.ch/faq/knowledge-base. We are happy to help you with additional questions and you can reach us under support@centi.ch!