I understand your frustration about the documentation available on the box/swagger. I would request you to check out the Aruba Developer Hub for AOS 8. Here you will find Guides on how to get started with API as well as API Reference (how you see on swagger). The API Reference consists of commonly used API endpoints with appropriate documentation. Check out the AP Provisioning API on the API Reference.
There's a prerequisite step involved while using this API, which you can find in the above API reference.Alternatively, you can use the showcommand API to mimic the CLI command "show provisioning-params" via API to get a JSON formatted response. To find out more on how to use this API, check out this page on the Developer Hub.
Hope that helps!
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