curl --request POST \
  --url https://api.interchange.io/api/v2/buyer/advertisers/{advertiserId}/catalogs/{catalogId}/activation-plan/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{}'

{
  "plan": {
    "planId": "<string>",
    "catalogId": "<string>",
    "platformCatalogId": "<string>",
    "catalogVersionId": "<string>",
    "transformId": "<string>",
    "planHash": "<string>",
    "itemCount": 4503599627370495,
    "campaignGroups": [
      {
        "key": "<string>",
        "name": "<string>",
        "fieldValues": {},
        "itemIds": [
          "<string>"
        ],
        "itemCount": 4503599627370495,
        "budget": {
          "amount": 1,
          "currency": "<string>"
        }
      }
    ],
    "creativeAssets": [
      {
        "key": "<string>",
        "prompt": "<string>",
        "fieldValues": {},
        "itemIds": [
          "<string>"
        ],
        "itemCount": 4503599627370495
      }
    ],
    "syndicationTargets": [
      {
        "adcpAgentId": "<string>",
        "usesTransformedCatalog": true,
        "requiresCreativeAssembly": true,
        "creativeAgentId": "<string>",
        "reason": "<string>"
      }
    ],
    "createdAt": "2023-11-07T05:31:56Z"
  }
}