curl "https://app.trackrev.io/api/v1/channels?days=30&ltv=1" \
  -H "Authorization: Bearer <your secret key>"

{
  "window": { "from": "2026-06-21T00:00:00.000Z", "to": "2026-07-21T00:00:00.000Z" },
  "channels": [
    {
      "channel": "newsletter",
      "clicks": 1204,
      "visitors": 980,
      "conversions": 47,
      "revenue": 4231.5,
      "ltv": 9120.0
    },
    {
      "channel": "twitter",
      "clicks": 860,
      "visitors": 731,
      "conversions": 18,
      "revenue": 1620.0,
      "ltv": 3040.0
    }
  ]
}