COUPON

A dashed-border coupon card with a tap-to-copy code and an optional countdown. Disappears entirely once end_time has passed, like FLASHSALE.

{
  "type": "COUPON",
  "params": {
    "code": "WELCOME20",
    "discount_text": "20% OFF your first order",
    "description": "Applies at checkout",
    "end_time": 1782000000
  }
}

• code — required; the widget renders nothing if it's missing or empty. Tapping the code copies it to the clipboard via Clipboard.setData.
• discount_text / description — free-text headline and subtext.
• end_time — a Unix timestamp in seconds, or an ISO-8601 string. When omitted, the coupon shows with no countdown and never expires.