You can pay via PayPal, credit card, direct debit, and instant bank transfer.
If you would like to change your payment method, you could open Nero Start, click the third icon in top right corner to open 'Manage my account'.
Under 'My Product' tab, click the Details link to open your order management web page. This web page is managed by Nero online shopping provider 2CheckOut.
You could update your payment method in the web page.