curl --request GET \
  --url https://api.interchange.io/api/v2/buyer/planning-briefs/{briefId} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "customerId": 0,
  "advertiserId": 0,
  "buyerName": "<string>",
  "advertiserName": "<string>",
  "campaignName": "<string>",
  "audience": "<string>",
  "geo": "<string>",
  "channels": [],
  "exclusions": [
    {
      "values": [],
      "raw": "<string>"
    }
  ],
  "startDate": "<string>",
  "endDate": "<string>",
  "flexibility": {
    "days": 4503599627370495
  },
  "statedBudget": 123,
  "currency": "<string>",
  "primaryKpi": {
    "raw": "<string>",
    "parsed": {
      "value": 123
    }
  },
  "priceExpect": 123,
  "creativeReady": true,
  "rawPrompt": "<string>",
  "qualifiedBudget": 123,
  "recommendedProducts": [
    {
      "productId": "<string>",
      "name": "<string>",
      "estimatedCpm": 123,
      "estimatedImpressions": 4503599627370495,
      "estimatedReach": 4503599627370495,
      "matchPct": 50,
      "rationale": "<string>"
    }
  ],
  "createdAt": "<string>",
  "updatedAt": "<string>",
  "targets": [
    {
      "id": "<string>",
      "demandSignalId": "<string>",
      "storefrontId": "<string>",
      "externalPublisherName": "<string>",
      "externalPublisherDomain": "<string>",
      "matchPct": 50,
      "dispatchAttemptedAt": "<string>",
      "dispatchedAt": "<string>",
      "acknowledgedAt": "<string>",
      "errorMessage": "<string>",
      "createdAt": "<string>",
      "updatedAt": "<string>"
    }
  ]
}