Before you can send requests from this collection, you must retrieve an access token.
Select the collection.
Click the Authorization tab.
At the bottom of the page, click Get New Access Token.
After a few seconds, the Manage Access Tokens page is displayed.
Click Use Token.
Note: Most tokens expire after 2 hours. If your expired token is not automatically refreshed, you must repeat this procedure. To ensure expired tokens are automatically refreshed, these two conditions must be met:
In the properties of the authorized app, Issue Refresh Tokens is selected.
In the properties of the Postman collection, Auto-refresh token is selected.