This guide takes you through the steps to get a System User access token for the News Indexing API.
You will need the following:
In the Business Manager, go to Business Settings > System Users and select an existing system user or create a new one.
Add your Facebook App as an asset to the System User. Go to Business Settings > System Users > Select the system user > Add Assets and add the App
Click Generate New Token and select your Facebook News Indexing app from the dropdown menu. Then, click Generate Token.
Copy the System User Access Token (SUAT) before closing the pop-up window. You will not be able to retrieve this token once the pop-up window is closed.