curl --request GET \
  --url https://{operatorDomain}/v1/admin/promotions/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "<string>",
    "name": "<string>",
    "slug": "<string>",
    "description": "<string>",
    "discountPercent": 123,
    "discountAmountCents": 123,
    "currency": "<string>",
    "scope": {
      "productIds": [
        "<string>"
      ],
      "categoryIds": [
        "<string>"
      ],
      "destinationIds": [
        "<string>"
      ],
      "marketIds": [
        "<string>"
      ],
      "audiences": [],
      "fareCodes": [
        "<string>"
      ],
      "cabinGradeCodes": [
        "<string>"
      ]
    },
    "conditions": {
      "minPax": 123,
      "pastGuestOnly": true,
      "soloTravelerOnly": true,
      "childTravelerOnly": true,
      "familyOnly": true
    },
    "validFrom": "2023-12-25",
    "validUntil": "2023-12-25",
    "code": "<string>",
    "stackable": true,
    "active": true,
    "metadata": {}
  }
}