Yes, that's possible. When you sign up for an account with Kassatellen.nl, you can use all functionalities for free for the next 7 days. You are not obliged to anything, and we don't ask for credit card details.
If you are satisfied and want to continue using the system after the trial period expires, we will ask you to verify your IBAN once, so that we can collect the subscription fees monthly by direct debit. As long as you don't verify your IBAN, we will not collect any money from your account.