Do you have a Walter Plus or Premium subscription and would you like to update your bank account? You can do so in your Walter account.
Go to https://app.walterliving.com/account/subscription and click "Update my bank account". You'll need to make a one cent verification payment via iDEAL. This amount will be refunded to you automatically within a few days.
You'll receive a confirmation email after completing the verification process. The new bank account will be used to charge your subscription from the next billing cycle onward.