Provisioning a blueprint (scripted)

I am looking for a way to programmatically provision a blueprint. Basically we want to build a catalog and user selection should just provision a blueprint with default values. We don't intent to show the dcac interface to order a VM.

tried to lookup api reference, but could not figure out a way to do so.

http://communities.vmware.com/servlet/JiveServlet/download/2177503-102136/DynamicCloudInterface.html

appreciate any leads, good day !