Interface Microsoft VSTS to vCloud Director (not to vCenter)

Hi

We've been asked to provide access for Microsoft VSTS to provision VMs on behalf of one of our vCloud tenants.  I understand that VSTS has a vCenter endpoint capability but there's nothing I can find to allow it to talk to vCloud Director.

Has anyone had any experience with configuring VSTS access to vCloud, perhaps via REST API?

Thanks

Jonathan