Postman is great for testing/development.
But it’s not advised to be used for production/end streamers to poke about with.
With this you have to
where as if you set up a proper production tool, you send them a link.
No faff/no setup it just works.
Postman involves too much faffing about and the fact you are juggling client/secrets, and cannot automate the collection of the streamers access token.
It’s not a good idea, and it may be a violation of the Developer Agreement if you are storing the Client Secret in something you don’t control (or passing the client secret to a streamer to enter manually into postman)
Postman is a tool for development and testing. It’s not a production ready tool/app