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 : .
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.