The configuration files for the VAT Validation module are in ini format. You can also use a simple text editor to edit these files. The file with the settings for the USt-IdNr check module can be found in the configuration directory under the file name
We recommend that you always use the configuration interface even if you use the VAT Validation module as a cli/service.
In case of a VAT registration check support case, we may request these files to recreate your exact configuration. As mentioned in the VAT ID check debug case, these files may contain sensitive data. Please ensure that the files are protected from unauthorized access.
Please make sure that you have always backed up the files when manually changing configuration files of the VAT Validation.