Hey @kibang,
Thanks for reaching out about this and welcome to our Developer Community! 
As you mentioned, the first step will be to create a JWT app. Once you’ve done this, you’ll need to copy the token from your app’s credential’s page to use for authenticating requests to our APIs. You can follow the steps outlined in this post to copy a token:
Once you’ve done that, you can pass that token as the value of your bearer token when calling our API. The easiest way to do this would be to use the embedded tool in our documentation. For example, if you want to list meetings under your account, you can call this endpoint:
https://marketplace.zoom.us/docs/api-reference/zoom-api/meetings/meetings
If you scroll to the bottom of that page, you can test this out by passing your JWT token into the access token field, and the user whose meetings you want to list as the value of user id:
I hope this helps!
Will