Walled Garden for blocked user

Is it possible for zima to make a walled garden for payment app like gcash in the PH. so that our clients can use the app to pay if they are disconnected. Thank you

Walled garden concept exists with Hotspot protocol. With PPP it is impossible to do redirect page.
We have a plan to work on captive portal with DHCP protocol. It could be the closest solution to your requirement.
Another method that could work also is the notifications feature: sending email or sms or whatsapp to user to notify.

Which method do you prefer?