Getting 403 Forbidden Error Using Postman to Query Channels

I have followed the doc precisely by providing the Bearer Token and the content-type, but I’m getting 403 error. Below is the information I used to send the request.

Method: POST
URL Endpoint:
Authorization: Bearer {{ Admin’s Access Token }}
Content-type: application/x-www-form-urlencoded
Body: None
Params: None

Issue closed. Wrong API Endpoint.