curl --request GET \
  --url https://api.interchange.io/api/v2/buyer/campaigns/{campaignId}/creative-confirmation \
  --header 'Authorization: Bearer <token>'

{
  "coverage": {
    "total_placements": 0,
    "covered_placements": 0
  },
  "files": [
    {
      "file_id": "<string>",
      "filename": "<string>",
      "detected": {
        "dimensions": "<string>",
        "duration": "<string>"
      },
      "preview_url": "<string>"
    }
  ],
  "campaign_name": "<string>",
  "missing_placements": [
    {
      "placement_id": "<string>",
      "placement_name": "<string>",
      "spec_label": "<string>",
      "product_name": "<string>"
    }
  ],
  "truncated": true
}