flexi cart - A comprehensive shopping cart library for CodeIgniter

[eluser]AlwynW[/eluser]
Again thanks for taking the time to look at my question. It seems to be a combination of things I did wrong (got the settings right after all). Note to self, make sure you only load the library once. I did a load on construct and another in the controller function which messed it all up. I figured it out and everything works as expected now!

Another question though, is it possible to configure the following system, either with points or vouchers and what would be the best way to go:

Each purchase grants the user a discount of 2% of the amount (of the current sale) for the next purchase. The user should be able to save these discounts until they want to use it (after each next purchase the discount adds to the existing one).
So it's not mandatory they use it for a next purchase.
I think the point system is not really useful for this or I had to abuse it so each point is in fact 1 euro/dollar.