Can I retrieve unlisted content posts using API?

Yes, you can retrieve unlisted content by enabling the parameter (get_unlisted_data) in the relevant endpoint.

Endpoint settings

On the endpoint list screen, locate the content list endpoint (Topics::list) and click [Update].

Under "Advanced settings", select the get_unlisted_data box and save these settings.

Response verification

On the endpoint list screen, click [Suagger UI].

Locate the target endpoint and click [Try it out].

Click [Execute].

You should see unlisted contents included in the response.
The topics_flg for the unlisted content will be 0.