code: import stripe
  stripe.api_key = "sk_test_your_key"
  
  stripe.Coupon.modify(
    "Z4OV52SU",
    metadata={"order_id": "6735"},
  )
  '''Response {
    "id": "Z4OV52SU",
    "object": "coupon",
    "amount_off": null,
    "created": 1659519093,
    "currency": "usd",
    "duration": "repeating",
    "duration_in_months": 3,
    "livemode": false,
    "max_redemptions": null,
    "metadata": {
      "order_id": "6735"
    },
    "name": "25.5% off",
    "percent_off": 25.5,
    "redeem_by": null,
    "times_redeemed": 0,
    "valid": true
  }'''
nl: Update a couponUpdates the metadata of a coupon. Other coupon details (currency, duration, amount_off) are, by design, not editable.Parameters metadata optional dictionary Set of key-value pairs that you can attach to an object. This can be useful for storing additional information about the object in a structured format. Individual keys can be unset by posting an empty value to them. All keys can be unset by posting an empty value to metadata. name optional Name of the coupon displayed to customers on, for instance invoices, or receipts. By default the id is shown if name is not set.More parametersExpand all  currency_options optional dictionary preview feature ReturnsThe newly updated coupon object if the call succeeded. Otherwise, this call raises an error, such as if the coupon has been deleted