How can I do this.Non-payment page

How can I do this.
When the customer has not paid.

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This was possible during the http days. It was done as follows:

With Https this cannot be done anymore.
It is sad because it was handy back then and simple.

Notifications feature could replace this functionality by sending an automated email/sms/whatsapp/or push notifocation when the account is about to expire, and when it expires with a link to the client portal for more information

How can this be done?

(There are billing systems that have web notification.)