You can log in to the new webshop with your current data. After logging in for the first time, you will immediately be asked to change the password. In this way we were able to migrate this personal data securely.
In the new webshop we ask for an e-mail address everywhere, so no longer a username. The username will still be available in the background for a while, but it will be phased out. This way, everyone uses a unique email address to log in with, which is important for security reasons.