For the deutsche post they published the technical specs. In chapter 5 the information for the datamtrix is specified. https://www.deutschepost.de/de/d/dv_freim

For the deutsche post they published the technical specs. In chapter 5 the information for the datamtrix is specified. https://www.deutschepost.de/de/d/dv_freimachung/downloads.html https://www.deutschepost.de/de/d/dv_freimachung/downloads.ht...