The discount-code overlay for the moment you say the code out loud — a checkout walkthrough, an affiliate spot, the last frame of a haul. The code is set in the mono face because it is something to be typed exactly, so keep it short and unambiguous; letters that read as digits cost more in mistyped checkouts than a clever word wins. The chip is sized for a code of about eight characters and grows rightward, so check a longer one in the preview before publishing.