Do you want to sell subscriptions for your IProperty website in order to allow users to manage listings with no administrator intervention? Look no further! Our friends at Akeeba Subscriptions and AEC Membership Management have a solution! IProperty subscriptions integration!
Using one of these subscription management components will let site visitors create accounts, sign up for free or paid subscriptions (your choice), and add and maintain their own listings without adding to your admin workload. You can define multiple subscription levels that set maximum listings, agents, and featured items, and handle all payments through recognized gateways including Paypal and Google Checkout.
Please contact the developers of these fine components for specifics and installation / configuration support.