coupon

record coupon {
  amount-off: option​<s32>,
  applies-to: option​<coupon-applies-to>,
  created: s32,
  currency: option​<string>,
  currency-options: option​<coupon-currency-options>,
  duration: coupon-duration-enum,
  duration-in-months: option​<s32>,
  id: string,
  livemode: bool,
  max-redemptions: option​<s32>,
  metadata: option​<coupon-metadata>,
  name: option​<string>,
  object: coupon-object-enum,
  percent-off: option​<f64>,
  redeem-by: option​<s32>,
  times-redeemed: s32,
  valid: bool,
}