The blog shows you one of the ways to get the Access Token from LinkedIn by using Postman. I spent 2 days to get this correct so you don’t have to spend 2 days.
Firstly, you need to get to https://www.linkedin.com/developer/apps/ to register an apps to get the Client ID and Client Secret.
1. Open a new Tab in Postman. Choose POST. I put this as url https://www.linkedin.com/oauth/v2/accessToken. Click on Authentication tab.
2. Click on Get New Access Token.
Type in the following in the following fields, of course, like Callback URL you need to put wherever you want to put. The Auth URL for now is still https://www.linkedin.com/oauth/v2/authorization till LinkedIn change it. The Access Token URL is https://www.linkedin.com/oauth/v2/accessToken. The State you can put anything.