Quba’s community support via Github issues and the mailing list is free.
The Quba-manual is currently only the plan to have a manual.
For E-invoice related command line tools please visit our open source-sister project.
Commercial support, like the implementation of new features, can be requested with a 5h-minimum for 100 Euro/h at info@quba-viewer.org or in urgent cases by calling ++49+6956994020.
The to add the functionality to display E-invoices (and/or validated them or convert them to PDF or other formats) you can use our software-as-a-service Mustangserver.
