Today, March 7th, 2025 we published a a new version of our e-invoicing REST API, Mustangserver.
It brings the benefits of Mustangproject version 2.16.3, e.g. the possibility to specify item based charges and allowances also using JSON, and fixes a potential security as well as a maintenance issue.
Existing users already see the 1.6.3 option, new users can subscribe for a free 30 day evaluation period. Version 1.6.3 will become the new default version as of tomorrow.