Are you asking can you use Oculus rift, and Unity to make something.....if so, yes for sure. Its very easy.
If you know unity and can make a level etc, then you can just add the Oculuse plugin and assetPackage. Drop in the Oculus player controlller (that has the OVR camera rig setup already) and it works.
Really simple
-P
Drift VFX Visual, Virtual , Vertical Want 970GTX on Macbook for good FPS? https://forums.oculus.com/viewtopic.php?f=26&t=17349
If you were referring to using the PlatformSDK through Unity, you can do that as well. See https://developer.oculus.com/documentation/platform/latest/tasks/dg-update-game-unity/. The platform unity package is part of the 1.3 sdk download in /Platform/Unity/OculusPlatform.unitypackage
Although it seems IAP access is not yet turned on through the developer interface.