How to make successful connection OAUTH2.0 with grant type client credentials in postman

vijayakumar kon
Tera Contributor

I am trying to get access token in postman with OATUH2.0 with grant type client credentials, but it fails. I have given correct client id and password.

3 REPLIES 3

Ankur Bawiskar
Tera Patron
Tera Patron

@vijayakumar kon 

check my blog

OAuth 2.0 with Inbound REST 

If my response helped please mark it correct and close the thread so that it benefits future readers.

Regards,
Ankur
✨ Certified Technical Architect  ||  ✨ 9x ServiceNow MVP  ||  ✨ ServiceNow Community Leader

Nilesh Pol
Tera Guru

Hi @vijayakumar kon 

Common Issues and Troubleshooting:

  1. Invalid Token URL: Double-check that the token URL you’re using is correct. It should be provided by the API you are trying to access.

  2. Incorrect Client ID or Secret: Ensure that both the Client ID and Client Secret are correct. Even small typos can cause authentication failure.

  3. Scope Missing: Some APIs might require a scope, so if it's required, ensure you have added it correctly.

  4. Authorization Server Configuration: Sometimes, the issue may lie with the authorization server itself. Ensure the OAuth 2.0 server is correctly configured to support client credentials.

  5. Response Body/Error Message: Look at the response body for any error messages. For example, the response might contain:

    • invalid_client (if client ID or secret is wrong),
    • invalid_grant (if the grant type or credentials are incorrect),
    • invalid_scope (if a required scope is missing).
  6. Content-Type Header: In some cases, you may need to manually set the Content-Type header in the Headers tab to application/x-www-form-urlencoded.

 

AndersBGS
Tera Patron
Tera Patron

Hi @vijayakumar kon ,

 

I can recommend below articles, as this led me to set it up yesterday for the first time myself:

https://sapphirenow.dev/post/wdc-oauth-part-1/

https://sapphirenow.dev/post/oauth-part-2/

 

If my answer has helped with your question, please mark my answer as the accepted solution and give a thumbs up.

Best regards
Anders

Rising star 2024
MVP 2025
linkedIn: https://www.linkedin.com/in/andersskovbjerg/