curl -X GET "https://api.affonso.io/v1/program/creatives/creative_abc123" \
  -H "Authorization: Bearer sk_live_your_api_key"

{
  "success": true,
  "data": {
    "id": "creative_abc123",
    "name": "Summer Sale Banner",
    "description": "728x90 leaderboard banner for summer promotion",
    "category": "banner",
    "subcategory": "leaderboard",
    "url": "https://cdn.acme.com/banners/summer-728x90.png",
    "content": null,
    "tags": ["summer", "sale", "leaderboard"],
    "dimensions": { "width": 728, "height": 90 },
    "usage_notes": "Use on blog sidebars and headers",
    "restrictions": null,
    "created_at": "2024-05-01T10:00:00.000Z",
    "updated_at": "2024-05-01T10:00:00.000Z"
  }
}