curl --request POST \
  --url https://api.interchange.io/api/v2/buyer/campaigns/{campaignId}/creatives/create \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{}'

{
  "creative_id": "<string>",
  "name": "<string>",
  "assets": [
    {
      "asset_id": "<string>",
      "name": "<string>",
      "original_filename": "<string>",
      "asset_type": "IMAGE",
      "content_type": "<string>",
      "file_size": 0,
      "public_url": "<string>",
      "asset_source": "CREATIVE_SOURCE",
      "created_at": "2023-11-07T05:31:56Z"
    }
  ],
  "campaign_id": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "message": "<string>",
  "brand_domain": "<string>",
  "template_id": "<string>",
  "format_id": {
    "id": "<string>",
    "agent_url": "<string>",
    "width": 123,
    "height": 123,
    "duration_ms": 123
  },
  "target_format_ids": [
    {
      "id": "<string>",
      "agent_url": "<string>",
      "width": 123,
      "height": 123,
      "duration_ms": 123
    }
  ],
  "preview_url": "<string>",
  "html_processing": {
    "rewritten_refs": [
      {
        "original": "<string>",
        "cdn_url": "<string>"
      }
    ],
    "unresolved_refs": [
      "<string>"
    ],
    "inserted_macros": [
      "<string>"
    ],
    "processed_html": "<string>",
    "processed_html_url": "<string>"
  },
  "auto_detected_template": {
    "template_id": "<string>",
    "template_name": "<string>",
    "method": "tag_hints"
  },
  "creative_manifest": "<unknown>",
  "sync_status": {
    "synced": true,
    "agent_count": 0,
    "last_synced_at": "2023-11-07T05:31:56Z"
  },
  "tracking": {
    "supported_macros": [
      "<string>"
    ],
    "impression_tracker_url": "<string>",
    "click_tracker_url": "<string>"
  },
  "frequencyCaps": [
    {
      "max_impressions": 3,
      "window": {
        "interval": 123,
        "unit": "seconds"
      },
      "id": "12345",
      "targetLevel": "ADVERTISER",
      "targetId": "camp_abc123",
      "createdAt": "<string>",
      "updatedAt": "<string>",
      "archivedAt": "<string>"
    }
  ]
}