Your Onna installation comes packaged with a OAS(OpenAPI) integration.

Append /@docs onto your API URL to view the OAS docs, like

If you are already logged in, it should detect your authorization token and have you automatically ready to test API calls.

If not, click the Authorize button and provide your own authorization credentials.

From the Authorize button, you can also customize what url you want to inspect the available endpoints from.

Since the API is hierarchical, each resource, datasource, etc has different endpoints available.