Data Storage and Retrieval

I am eagerly waiting for information about the Data ClientData Storage and Retrieval.

Described in the DeveloperDocs under the GrantType Authorization Code Grant:

“Provides access to Manifold’s read and write Data APIs. Also provides access to Manifold’s server-to-server APIs.”

However, the link that should lead to “Data APIs” is dead and does not lead anywhere.

Is there any ETA or status on the development of Data Storage and Retrieval or any documentation if and how to use the DataAPI and store user data?