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Make sure you have registered or created an application on the Meta Developer, then it with your Facebook account to get your own Application ID and Secret Key. To get the Access Token, you must add the following application permissions: "pages_show_list, pages_read_engagement, and pages_manage_posts". If you have, you just need to generate an access token in the "Features > Graph API Explorer" menu on the Meta Developer website, don't forget to connect your Facebook account.

Read more full information here:

• https://developers.facebook.com/docs/video-api/overview
• https://developers.facebook.com/tools/explorer/
• https://developers.facebook.com/docs/pages-api/getting-started/