List payout sessions

Example response

{
  "sessions": [
    {
      "id": 1,
      "title": "April 2026 Payouts",
      "description": "Monthly payout run for April 2026",
      "created_at": "Tue Sep 01 2026 09:54:14 GMT+0200 (Central European Summer Time)",
      "updated_at": "Tue Sep 01 2026 09:54:14 GMT+0200 (Central European Summer Time)"
    }
  ]
}