I recommend setting up scheduled cron jobs to regularly check user plan expiration and send email notifications as needed.
Check the cron example below & change the "http://zeph.barbercita.com" to your site address.
Cron Url
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https://example.com/run-cron
Cron Example
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* * * * * wget -q -O - http://zeph.barbercita.com/run-cron >/dev/null 2>&1