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Latest info that I remember getting is that Rancher doesn't provide API documentation, developers are asking to use Terraform. You can use 'debugging' in browser to find something. For your exact question

https://{{ rancher_hostname }}:{{ rancher_port }}/v3/clusters?name={{ usercluster_name }}

GET method, authentication via

Bearer

token that you get via

{{ rancher_url }}/v3-public/localProviders/local?action=login

, via

{ 'username': 'myuser', 'password': 'mypassword'}