I just discovered Home Assistant’s built in “Applications Credentials” storage (in the overflow menu on the Integrations / Devices / Entities / Helpers pages) and I figured it would be quite handy if I could use that credentials storage in combination with the REST integration, to pull data from OAuth authenticated REST APIs into sensors (in addition to the currently available User/PW authentication).
This should allow users to easily integrate a lot of services with a (somewhat) standardized API into Home Assistant!