curl -X GET "https://api.linquid.io/api/pixels?page=1&limit=25&campaignId=campaign_123" \
  -H "Authorization: Bearer <token>"

{
  "success": true,
  "data": [
    {
      "id": "pixel_abc123",
      "campaignId": "campaign_123",
      "name": "Checkout Pixel",
      "pixelCode": "checkout_pixel",
      "conversionTracking": true,
      "enabled": true,
      "createdAt": "2026-02-20T10:30:00.000Z"
    }
  ],
  "meta": {
    "page": 1,
    "limit": 25
  }
}