Create a Trial period option for all products
I am trying for some time now to offer on my existing products some trial period which after will hopefully lead to a continuation to the paid service. This option is not available on whmcs right now.
So for example John wants to try my hosting for a month and then if the service is good he will continue using my hosting and pay for the service. Most hosting providers do that and is a good catch and start to get clients.
If you find it useful please vote for it.