Good Afternoon Andreas, 
The following link will take you to our DocuWare Platform API page.
http://help.docuware.com/sdk/platform/html/66b2ed1e-2aef-452a-97cd-5014b...
This should help get you started with using the API. 
If you run into issues, please feel free to submit a Support Request. 
Ryan Ciszkowski
Software Support Specialist
Support Team Fortis – America