You can use the parameters to specify the XML data for the ZUGFeRD file when calling the “Pdfa” web service.
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
If the "<zugferd>" element is defined, the web service will embed the "<xmlFile>" file (Base64-encoded) during the PDF/A conversion. Before being embedded, the XML data will be validated against the relevant schema and will only be embedded if valid. The schema version can be defined with the "version" attribute in the parameters.
Validation against the following schemas is supported:
•Version 1.0 - Comfort
•Version 2.0 - Minimum profile
•Version 2.0 - Basic WL profile
•Version 2.0 - Basic profile
•Version 2.0 - EN16931 (Comfort) profile
•Version 2.0 - Extended profile
For more information on ZUGFeRD and the structure of the XML file and its use, please visit https://www.ferd-net.de.