Delivery Direct private comms line equivalent for "api.refinitiv.com"

Hello all,

First step for publishing using RCC websockets direct to Refinitiv is to get an Access Token from RDP using REST API request-response. This means a call to the endpoint "api.refinitiv.com" which is available over the Internet.

However is there any equivalent to "api.refinitiv.com" if you want to make this communication using Delivery Direct private comms lines rather than via Internet?

The domain "api.refinitiv.biz" does not seem to exist for example, is there a different endpoint to use?

Or is it only possible over Internet?

Thanks, Phil