Linkedin API access token generation error

Question

i am trying to generate access token to collect linkedin data. I followed the instructions provided in the linkedin API documentaion. I created an app in developers page and got the following:

Application Details
•   Company:
Fresher
•   Application Name:
xxxxxxxxxx
•   API Key:
75pcum6zb2cael
•   Secret Key:
xxxxxxxxxxxxxxxx
•   OAuth User Token:
xxxx-xxxx-xxxx-xxxx-xxxxxxxxxx
•   OAuth User Secret:
xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx

Using the API Key i generated the authorization_code with the URL:

https://www.linkedin.com/uas/oauth2/authorization?response_type=code&client_id=75pcum6zb2cael&state=DCEEFWF45453sdffef424&redirect_uri=https://www.google.com

but when i finally tried to generate the access token using the below URL, i got an error response :

https://www.linkedin.com/uas/oauth2/accessToken?grant_type=authorization_code&code=AUTHORIZATION_CODE&redirect_uri=https://www.google.com&client_id=75pcum6zb2cael&client_secret=xxxxxxxxxxxxxxxx

{"error_description":"missing required parameters, includes an invalid parameter value, parameter more than once. : Unable to retrieve access token : appId or redirect uri does not match authorization code or authorization code expired","error":"invalid_request"}

Even after multilple validations, the same error messages appears.

please help. thanks.

Answer 1

finally, i got the access token. The authorization code expires in 20 seconds, so the access token URL must be called immediately after generating the authorization code.