Let's look at an example of a $100 order going through a Carro retailer.
Let's say the revenue split is:
When a customer purchases an item from the retailer's store, the retailer captures the payment in full ($100).
Then, the retailer's credit card is charged the wholesale price of the product to account for the supplier's share ($70).
This $70 is routed to the supplier's bank account via Stripe.
This leaves the retailer with $30 of the sale.
Carro's 5% is accounted for as 2.5% from each both brands, but at the end of the retailer's Shopify billing cycle, Carro charges its 5% to the retailer, which in this case is $5 (this can be reported as one charge or broken down into line items for bookkeeping).
This leaves the retailer with $25, the supplier $70, and Carro 5$.