List deployments in the last 7 days

[Gareth Hughes]

We would like to list out the deployments done in the last 7 days in order to see which environments have been updated and get an idea if we have unused environments.

I am happy to dive into the API to do this but I am seeing gaps in the REST API and the guides also have gaps.

For instance this answer is partially helpful, but raises more questions
https://community.atlassian.com/t5/Answers-Developer-Questions/Bamboo-REST-API-GET-releases/qaq-p/498456

1. How do I get a list of environment IDs?

2. Where is this answer documented in the REST Guide? I see nothing that matches this URL

thanks a lot