curl -X GET https://api.linquid.io/api/campaigns/campaign_xyz789 \
  -H "Authorization: Bearer <token>"

{
  "success": true,
  "data": {
    "id": "campaign_xyz789",
    "name": "Summer Sale",
    "status": "active",
    "type": "link",
    "goalType": null,
    "goalValue": null,
    "costModel": "cpc",
    "costOverride": 0.5,
    "costCurrency": "USD",
    "conversionTracking": true,
    "createdAt": "2026-02-20T10:30:00.000Z"
  }
}