Do customers always have to enter their house number in the ‘House number’ field when ordering?

No, customers do not have to enter their house number again and again. If the additional fields are filled in, they are also read out. If the additional fields are not yet filled, for example because the plugin has been newly installed, then the value of the street is always read from the Shopware standard field street. If the customer saves the data in the storefront, we also save the two additional fields in the Shopware standard street field, separated by spaces.