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

[vijayakumar kon]

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.

[Ankur Bawiskar]

@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.

[Nilesh Pol]

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]

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/