As an admin user having WhatsAPP or/and Messenger channels I need to get email/system notifications to Refresh temporary Access Token on my Developer Facebook Account every 23 hrs.

Please, check how we can get a Long-Lived User Access Token here : https://developers.facebook.com/docs/facebook-login/guides/access-tokens/get-long-lived/ .

If you need a long-lived User access token you can generate one from a short-lived User access token. A long-lived token generally lasts about 60 days.

You will need the following:

A valid User Access Token

Your App ID

Your App Secret

Query the GET oauth/access_token endpoint.