LinkedIn accessToken获取及TYPO3集成权限问题咨询

I’ve run into this exact issue before when integrating LinkedIn content into CMS platforms like TYPO3, so let’s break down what’s going wrong and how to fix it:

Why You’re Getting This Error #

LinkedIn restricts the client_credentials grant type by default—your app needs specific permissions, enabled flows, and possibly verified status to use it. The error message means your app isn’t authorized to generate application-level access tokens yet.

Step-by-Step Fixes #

1. Enable Client Credentials Flow in Your App

   • Head to the LinkedIn Developer Portal, open your app, and navigate to the Auth tab.
   • Look for OAuth 2.0 Settings → Allowed OAuth Flows. Make sure the Client Credentials Flow checkbox is ticked. If you don’t see this option, your app might need to be upgraded to a Verified Company App (more on that later).

2. Add the Required Product & Permissions
   To fetch your company’s LinkedIn news, you need the r_organization_social permission (application-level access to your company’s social content):

   • Go to the Products tab of your app. Search for and add the Marketing Developer Platform product. LinkedIn will review this request (usually takes 1-2 business days).
   • Once approved, go back to the Auth tab → Application Permissions. Check the box for r_organization_social and save your changes.

3. Use the Correct Request Method
   You mentioned using a GET request for the access token—but LinkedIn requires this request to be a POST (GET is not supported for client credentials flow, which is likely contributing to the error). Here’s the correct format:

   curl -X POST 'https://www.linkedin.com/oauth/v2/accessToken' \
     -H 'Content-Type: application/x-www-form-urlencoded' \
     -d 'grant_type=client_credentials&client_id=YOUR_CLIENT_ID&client_secret=YOUR_CLIENT_SECRET'
   

4. Link Your Company Page to the App

   • Go to the Company Pages tab in your app’s settings.
   • Click Add Company Page and follow the prompts to link the LinkedIn page you want to pull news from. This ensures the application-level token can access that page’s content.

5. Verify Your App (If Needed)
   If you still don’t see the Client Credentials Flow option, your app needs to be a Verified Company App:

   • Navigate to the Settings tab → Verification.
   • Submit the required documentation (like a business license or official letter) to verify your app is associated with your company. LinkedIn will review this, and once approved, the flow will be enabled.

Final Checks #

After completing these steps, retry the access token request. Once you have a valid token, you can use it to call the LinkedIn API endpoint for fetching company posts (e.g., GET /v2/organizationalEntityShareFeed?q=organizationalEntity&organizationalEntity=urn:li:organization:{YOUR_COMPANY_ID}) and integrate that data into your TYPO3 site.

内容的提问来源于stack exchange，提问作者netzteil