Our API is central in everything we do and using our API gives you 100% control of all functionality. Find the documentation here: DC 5.6 API Documentation
The Digizuite™ API is not an afterthought - it is front and center for all our DAM functionalities. In fact, we have built our products (Digizuite™ Media Manager, DAM for Sitecore module and the DAM for Optimizely Add-on, and more more) on top of the API... and you can do the same.
Digizuite's experienced team is with you all the way to make the integration process as smooth and efficient as possible. And if you need more advice later on, we’re never further than a phone call away.
SDK is here: https://digizuite.github.io/Digizuite.SDK/
DIgizuite R&D is actually using the SDK internally in places which ensures quality of the SDK as well as it being up-to-date with standard at any given time.