MUST KNOW PHPNUKE!
Online reservation system: Seeking a PHPNuke (version 7.5) module which allows administrators to set available time slots and allows registered users to reserve timeslots. Ready-made or built-from-scratch accepted. If all goes well, additional work available.
-Option to allow administrator to set his/her available time slots
-Each administrator will have a page displaying his/her available time slots
-Optional (if you can do it): User can only make a reservation after paying through PayPal IPN system.