A unique feature of the GroupDeal software is the introduction of the user wallet. This is a place where users can keep cash that they have earned from referring a friend, from gift cards that have been purchased for them or they can even pre-fund their wallet so that they never miss a deal or don't have to fill out the credit card form each time they make a purchase.
The convenience of using the wallet can't be underestimated because the user will feel like they are spending no money since they are just clicking some buttons and don't have to fetch their credit card each time.
Alternatively your users can cash out from their wallet if they have earned some money by referring their friends. They simply need to request a withdrawal and it is processed by the software automatically.