On September 24th, 2024, we published Mustangserver 1.4.1, which offers a improved document type recognition as well as ZUGFeRD 2.3.0 support with it’s corrected validation. Additionally, the manual has been extended, e.g. with a list, where in the JSON which BT IDs are passed.
Mustangserver 1.4.1 has become the new default version if a request on api.usegroup.de does not specify a particular version preference.