Is the 'REST API' for the new Certificate Based Subscription Management documented/supported ?

Issue

• Transitioning from the classic subscription management to the certificate based system.
• Want to automate as much as possible and looking into scripting the registration and entitlement of hosts.
• Upon inspection of the python code for the subscription-manager tool, found that it uses the REST API at subscription.rhn.redhat.com.
• Is this REST API documented and is its use supported?
  It is based on the candlepin project, which has API documentation.