Use this:

curl -X POST --http1.1 "https://www.linkedin.com/oauth/v2/accessToken" --cookie "X-Csrf-Token: 987654321" -d "grant_type=authorization_code&code=authorizationcodehere&redirect_uri=http%3A%2F%2Flocalhost%2Fcode&client_id=client_id&client_secret=client_secret" -H "Content-Type: application/x-www-form-urlencoded"

@shroffshivangi
can you please tell me how I get -cookie "X-Csrf-Token: 987654321"??? I can do all the things except X-CSRF- TOKEN.

It's same as the state that you put in the previous step.

@shroffshivangi

Hello,
I have a problem. I do not know why invalid requests shows. I am confused about redirect url
results are shown below.

invalid_request","error_description":"Unable to retrieve access token: a ppid/redirect uri/code verifier does not match authorization code. Or authorizat ion code expired. Or external member binding exists"

please help me out about this problem.

@shroffshivangi
Can you please tell what is the redirect url?? I used emblemidea.com for linkedin app. should I use callback encodeed url or any other url??

You can use any redirect url, it should just be a valid one.

If the redirect uri is https://www.google.com - Step 1 would be something like this:

https://www.linkedin.com/oauth/v2/authorization?response_type=code&client_id=your_client_id&redirect_uri=https%3A%2F%2Fwww.google.com&state=987654321&scope=rw_company_admin%20r_emailaddress%20w_share%20r_basicprofile

Note: the scope is what permissions you want your application to have.

@shroffshivangi
actually I want to solve step 3.
in step 3, in POST method, when I use git bash for get access token via using your 1st comment code sample, I get invalid as result. how can I solve it??

Hey @shroffshivangi ,
I am regardly waiting for your response. as I can't solve it. please help me in step 3 as documentation.