Get an add-on

curl --request GET \
  --url https://api.smokeball.com/subscriptions/addons/{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"
  },
  "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"
}