Wufoo.com -> Demo -> Form Settings -> Pasting the key in the description caused the preview to show the key.
This was sort of finicky to do, I'm not sure how reproducible it is? I also had the BTC key shoved in a bunch of other fields, some of which became partially visible.
This was sort of finicky to do, I'm not sure how reproducible it is? I also had the BTC key shoved in a bunch of other fields, some of which became partially visible.