We have exact same issue in Switzerland. There is no real work around or solution for companies outside germany who work with german customers. While there is an app for germany, there is no support for other countries. Instead we are asked to buy third party apps - only to be able to SEND an XML in a specific form. We don't need to handle XRechung ourself - we only need a solution to create an XML in that specific format. We even would'nt need to already have all information in the file. We only need that format to import it into an external system where we can add some specific XRechnung-informations.I really hope we won't have same issues with ViDA act - as i understood this is something what has to do with VAT (Value Added Taxes) in EU (while Switzerland is not part of EU).