What does the "space":{"key":"TST"} key mean in a request to add a page to Confluence?

Question

Python

What does the "space":{"key":"TST"} key mean in a request to add a page to Confluence?
What should be written there? What are they responsible for?
Taken from https://developer.atlassian.com/server/confluence/...

Answer 1

This is the space key. Spaces, in addition to the name, for example "Development Test Space", have a key, for example, as in your question - "TST".
For example, here is a screenshot from my conf, the properties of the IT Department space: