There are two ways for applications and websites to integrate with deviantART.
We've designed our APIs to use open standards so developers can leverage off-the-shelf libraries. We aim to provide APIs that are as simple as possible yet still open the door to great possibilities.
For our first API requiring authentication we've decided to use OAuth 2.0, a cutting edge open standard designed and adopted by a growing number of large websites.
We can't wait to see what cool things you'll build using these tools!
For any enquiries regarding integration with deviantART, you can reach us at firstname.lastname@example.org