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

{
  "collections": [
    {
      "collection_id": "<string>",
      "name": "<string>",
      "member_count": 4503599627370495,
      "creative_count": 4503599627370495,
      "asset_count": 4503599627370495,
      "attached_campaign_count": 4503599627370495,
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z",
      "campaign_id": "<string>",
      "brand_agent_id": "<string>",
      "description": "<string>",
      "metadata": {},
      "members": [
        {
          "member_id": "<string>",
          "created_at": "2023-11-07T05:31:56Z",
          "updated_at": "2023-11-07T05:31:56Z",
          "label": "<string>",
          "metadata": {},
          "creative": {
            "creative_id": "<string>",
            "name": "<string>",
            "created_at": "2023-11-07T05:31:56Z",
            "updated_at": "2023-11-07T05:31:56Z",
            "asset_count": 3,
            "campaign_id": "<string>",
            "format_id": {
              "id": "<string>",
              "agent_url": "<string>",
              "width": 123,
              "height": 123,
              "duration_ms": 123
            },
            "template_id": "<string>",
            "brand_domain": "<string>",
            "preview_url": "<string>",
            "requires_upgrade": true,
            "sync_status": {
              "synced": true,
              "agent_count": 0
            },
            "target_format_ids": [
              {
                "id": "<string>",
                "agent_url": "<string>",
                "width": 123,
                "height": 123,
                "duration_ms": 123
              }
            ]
          }
        }
      ],
      "attachments": [
        {
          "campaign_id": "<string>",
          "collection_id": "<string>",
          "created_at": "2023-11-07T05:31:56Z",
          "updated_at": "2023-11-07T05:31:56Z",
          "metadata": {}
        }
      ]
    }
  ],
  "total": 4503599627370495
}