You do not pay to publish. If a sale comes through your advertisement, that line is charged at the rate of the surface it ran on instead of your category's. Nothing else is deducted.
Advertisements are cards that sit among the content: on the home page, on category pages and on store pages. Each surface has a limited number of seats, and they go to whoever publishes first.
Banners are the wide strips at the top of a page: the home page, best sellers, a category page, a store page, a brand page. They carry no commission at all.
Both are reviewed before they go live, and both run inside a window you set.
The placement's rate replaces your category's rate on that line - it is not added to it. The figures are read from the live table, not from this page.
Nothing is deducted on these: Banner on the home page · Banner on the best sellers page · Banner on a category page · Banner on a store page · Banner on a brand page
One page gathers commission, delivery and payouts.
See the commission table