Vouch implements few business-stream slots in which any module can be plugged-in to feed facts and figures. The first and foremost slot is "Accounting", i.e., the facts and figures posted in General Ledger. And equally important second slot is "Inventory". The third slot, which is configurable and highly open-ended, practically usable for anything else a business may need, is "Standard Ledger".

We will discuss what these slots are all about, how to define rules for a module to be plugged in these slots, how best can be exploited the data fed through these slots.