I am working on a Webshop where purchases are done based on a points system rather than a dollar value. Each product is assigned a points value and when the customer purchases a product, his points are deducted from the accumulated points over time. Any help to point to the right plugin will be highly appreciated.
Instead of rebuilding Magento to only accept reward points maybe treat the currency as points.
So if something is 40 points, make it $40. Remove all tax and change the currency symbol from dollar to something like points through
System > Manage Currency > Symbols
Now lastly for paying. I would suggest looking for a good giftvoucher module that allows you to give the customer a certain amount of credit / points.
This is probably the easiest way since it's all visual and requires just a little module for charging customers