Hi @akio
If you are only going to use those 3 endpoints that you have shared, you can indeed do it with a basic plan
If you look closely into the Docs, those endpoints do not have any Prerequisite, which means you can access them with a basic plan.
For example, the Create a User endpoint shows the Prerequisite: * A Pro or higher plan.
https://marketplace.zoom.us/docs/api-reference/zoom-api/methods/#operation/userCreate
That being said, there are some endpoints that you will able to access but not all of them.
Hope this helps,
Elisa