An idea would be to create some gateway modules inside proptrack for the main payment gateways such as:
Worldpay
Paypal
2CheckOut
Google Checkout
There are about 25-30 different providers but the above are the ones I generally use for my non real estate business.
Then, PropTrack users would have to sign up themselves at the Merchant and enter their details into the proptrack system and then at least proptrack is not liable for any Chargebacks, that would be on the PropTrack member.
Craig Edmonds
www.123marbella.net