Where is the REST API documentation?

Hello,

We have many systems integrate to Druid via the REST APIs. I want to understand more about what each endpoint (request/response) content and setup.

Is there any place to check that? I tried to look here https://druid.apache.org/docs/latest/operations/api-reference.html but it has very simple docs. I need something like this https://help.shopify.com/en/api/reference/shopify_payments/payout

If there is not docs like this can you point me where I can get the technical details and I can build one for the community.