On Friday, September 29th 2023, on the occasion of the ninth ZUGFeRD developer days, we released Mustangserver 1.0, a e-invoicing REST API which allows users to validate, read, write and convert electronic invoices over the network in 56 programming languages. It supports XRechnung, Factur-X, ZUGFeRD and Order-X and is prepared for the planned german mandatory B2B invoices.
On the same conference, Mustangproject, the open source sister project of Mustangserver, was awarded a Best in Practise Award. Thank you very much!