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Hitesh chaudhariHitesh chaudhari 

unable to get Authorization token for linked in integration

trying to get Authorization token by hitting https://www.linkedin.com/oauth/v2/authorization via REST API get call.

but not able to get the access token in response. 
String Client_ID      = '81********51oj' ;
String Client_Secrete = '4u**********7wCD';
       
        String endPoint        = 'https://www.linkedin.com/oauth/v2/authorization?response_type=code&client_id=' + Client_ID ;
        String redirectPageURL = 'https://myDevInstance-dev-ed--c.ap5.visual.force.com/apex/LinkedInAuthPage'; 
        
        redirectPageURL = EncodingUtil.urlEncode(redirectPageURL, 'UTF-8');
        endPoint += '&redirect_uri=' + redirectPageURL ;
        endPoint += '&state=fooobar&scope=r_liteprofile%20r_emailaddress%20w_member_social';
        
        Http http = new Http();
        HTTPRequest req = new HTTPRequest();
        req.setEndpoint(endPoint);
        req.setHeader('Content-Type', 'application/json');

        req.setMethod('GET');
               
        HTTPResponse res = http.send(req);

but not able to get Response code as 200 whch gives me Authorization code  in response.