I need to be able to have customers carry a balance in the store, so when I found /app/code/core/Mage/Sales/Model/Quote/Address/Total/Custbalance.php I thought maybe I had found the solution.
However, this appears to be a stub which just sets the balance amount to zero.
Am I correct in assuming that this feature is not yet implemented in Magento? And that if I need it I’ll have to build it myself? either way, pointer would be greatly appreciated (and any progress will be reported back to the forum).