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Everything I've heard is that Rancher considers their REST API to be for their own use (i.e. not stable for others as they won't announce or soft roll-out changes). However recent versions of Rancher try to do more and more through Kubernetes, so you may be able to use kubectl for what you're aiming for.

https://ranchermanager.docs.rancher.com/v2.8/api/api-reference is related to the REST API that the above comment mentioned.