I need a script where based on monthly membership, tokens are accumulated and are used to buy items on a website. So the members need to be able to see the tokens and then buy items with the tokens they have accumulated. I need the tokens to be interactive with the shopping cart where if you have a certain amount of tokens you can purchase an item for the same amount of tokens. It's a similar concept used for popular online games. I want the user to have the ability to buy more tokens if they want a certain item, outside of what they are accumulating with the monthly payments being made.