curl --request POST \
  --url http://localhost:7701/api/v1/subscriptions/{uuid}/coupon \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "coupon_code": "SUMMER20"
}
'

{
  "data": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "status": "active",
    "plan": {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "Basic Monthly",
      "description": "<string>",
      "amount": 2990,
      "currency": "BRL",
      "interval": "monthly",
      "interval_count": 1,
      "trial_period_days": 7,
      "billing_day": 5,
      "is_active": true,
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z"
    },
    "customer": {},
    "card": {
      "last_4_digits": "4242",
      "brand": "visa",
      "expire_month": "12",
      "expire_year": "2028"
    },
    "coupon": {},
    "amount": 2990,
    "original_amount": 2990,
    "discount_amount": 500,
    "currency": "BRL",
    "interval": "monthly",
    "interval_count": 1,
    "billing_day": 5,
    "trial": {
      "period_days": 7,
      "start": "2023-11-07T05:31:56Z",
      "end": "2023-11-07T05:31:56Z"
    },
    "current_period": {
      "start": "2023-11-07T05:31:56Z",
      "end": "2023-11-07T05:31:56Z"
    },
    "next_billing_at": "2023-11-07T05:31:56Z",
    "paused_at": "2023-11-07T05:31:56Z",
    "paused_until": "2023-11-07T05:31:56Z",
    "canceled_at": "2023-11-07T05:31:56Z",
    "cancel_at": "2023-11-07T05:31:56Z",
    "cancel_at_period_end": false,
    "plan_change_at": "2023-11-07T05:31:56Z",
    "new_plan_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "metadata": [
      {}
    ],
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z"
  }
}