Hi @joemoussally111 ,
For users underneath the same Zoom account, you can use several of our app types (OAuth, Server-to-Server OAuth, JWT) to use the app credentials and make requests to the Zoom API via the Create a Meeting endpoint you referenced to programmatically create meetings. Please note that the JWT App Type is being deprecated so I did not even link it. The OAuth options are recommended.
To test making requests with OAuth, please reference this guide and follow the request format in the Create a Meeting API docs: Guide: Making a Zoom API Call with OAuth Credentials in Postman - #4
To test making requests with Server-to-Server, reference this guide: How to user Server-to-Sever OAuth app with Postman
If you would like to create meetings for external users (outside of the same Zoom account), you would need create and submit a public OAuth application on our Zoom Marketplace so users can install the app on their account and give permission for the app developer (you) or the app admins to create meetings on their behalf.
Hope this clears it up!