You may have received an error message when opening the fridge 
.
The reason is that we have changed our system; 
from now on, you will be automatically prompted to settle your outstanding balance if your account balance is negative. (This can happen, for example, if the limit has been exceeded, the card has expired, or the internet connection was briefly interrupted.)
Scan the barrier again to receive a payment link via email.
Once you have paid the amount, you can use the fridge again immediately as usual 