Need to know information at check out, such as if your visitor turned in their badge or wants to be added to your email list? You can add the same visitor fields available at check in to your Check Out button as well!
Start on your buttons tab on the left of your account dashboard. Select 'Existing Buttons' on the right then click to edit (or add a new one) then scroll down to the Visitor Fields section. You'll see on the right you can 'Add a Field':
This feature is available to any customers running the 4.1 version of the app or newer.