You’ll need an access token to use the Nuon API. You can get an access token by logging in via the Nuon dashboard or the Nuon CLI. To get your access token via the Nuon CLI, first login 
nuon login
then view the API token 
nuon orgs api-token

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Using the API Reference

You can call the Nuon API endpoints from the API Reference by adding Bearer <your-api-token> to the “Authorization” field in each endpoint card. Verify you’re API token with the current-user endpoint.