If you're a merchant with a lot of products and those products are assigned to third party merchants, vendors or partners, you need the Transparent Kitty App.
The concept is simple. Every line item is a product, and every product has a vendor. Since a product can have a cost price, the difference between the selling price and the cost price is the profit. The App takes care of calculating and reporting those sales. Vendors can be assigned accounts and thus they can see their share of sales and they can download the numbers for their own purposes.