Normally with PHP-SecureArea you use PayPal subscription facilities which control access to your secure area. So when the subscription expires the access to the secure area ends.
One issue with this is that the customer has to have a PayPal account rather than purchasing through a credit / debit card. This is because it is PayPal that controls the subscription process.
It is now possible with PHP-SecureArea to use a PayPal ‘buy now’ button which means that the customer can purchase with a credit / debit card. As it does not use subscriptions it means that access will not automatically end, but this can be controlled using the cron job which checks for manually created subscriptions.