Consideration
Send people from the street to your site. On top of the flighting cost, you can add outcome pricing so you pay per verified click-through.
This goal can carry outcome pricing on top of the flighting cost. You add a charge per action someone actually took, and only once it has been verified.
Available on transit and venue placements.
Outcome pricing needs an interactive layer: the UbuntuConnect WiFi portal, or a QR/NFC scan. That is why it runs on transit and venue placements, and not on billboards.
