Get promotion

curl --request GET \
  --url https://api.smokeball.com/subscriptions/promotions/{id} \
  --header 'Authorization: <api-key>' \
  --header 'x-api-key: <api-key>'

{
  "id": "b471682e-fa17-4e46-b7fe-9b2b8fdcb3c2",
  "href": "<string>",
  "relation": "<string>",
  "method": "GET",
  "self": {
    "id": "<string>",
    "href": "<string>",
    "relation": "<string>",
    "method": "GET"
  },
  "productSuite": "<string>",
  "tiers": [
    {
      "id": "b471682e-fa17-4e46-b7fe-9b2b8fdcb3c2",
      "href": "<string>",
      "relation": "<string>",
      "method": "GET",
      "self": {
        "id": "<string>",
        "href": "<string>",
        "relation": "<string>",
        "method": "<string>"
      },
      "smokeballId": "<string>",
      "productSuite": "<string>",
      "name": "Intake",
      "description": "<string>",
      "trialPeriodDays": 123,
      "prices": [
        {
          "default": true,
          "active": true,
          "type": "Recurring",
          "name": "\"$109 per user/month\"",
          "amount": 5900,
          "interval": "Monthly"
        }
      ],
      "createdDate": "2022-04-23T14:00:00Z",
      "updatedDate": "2022-04-23T14:00:00Z"
    }
  ],
  "addOns": [
    {
      "id": "b471682e-fa17-4e46-b7fe-9b2b8fdcb3c2",
      "href": "<string>",
      "relation": "<string>",
      "method": "GET",
      "self": {
        "id": "<string>",
        "href": "<string>",
        "relation": "<string>",
        "method": "<string>"
      },
      "smokeballId": "<string>",
      "productSuite": "<string>",
      "name": "Intake",
      "description": "<string>",
      "trialPeriodDays": 123,
      "prices": [
        {
          "default": true,
          "active": true,
          "type": "Recurring",
          "name": "\"$109 per user/month\"",
          "amount": 5900,
          "interval": "Monthly"
        }
      ],
      "createdDate": "2022-04-23T14:00:00Z",
      "updatedDate": "2022-04-23T14:00:00Z"
    }
  ],
  "usage": [
    "<string>"
  ],
  "name": "Summer Sale 2024",
  "description": "Summer Sale 2024",
  "durationDays": 7,
  "amountOff": 2000,
  "percentOff": 20.5,
  "active": true,
  "numUsed": 42,
  "createdDate": "2024-01-15T10:00:00Z",
  "expirationDate": "2024-12-31T23:59:59Z",
  "codes": [
    {
      "id": "promo_code_1234",
      "name": "SUMMER2024",
      "description": "100% discount!",
      "code": "SUMMER2024",
      "active": true,
      "minimumAmount": 5000,
      "firstTimeCustomersOnly": true,
      "limit": 100,
      "createdDate": "2024-01-15T10:00:00Z",
      "expiratonDate": "2024-12-31T23:59:59Z",
      "metadata": {}
    }
  ],
  "metadata": {},
  "isPersistent": true,
  "isFree": true,
  "deleted": true
}