curl "https://api.60db.ai/billing/transactions?limit=10" \
  -H "Authorization: Bearer your-api-key"

{
  "success": true,
  "data": {
    "transactions": [
      {
        "hash_id": "abc123",
        "amount": 50.00,
        "currency": "USD",
        "payment_type": "one_time",
        "status": "succeeded",
        "balance_before": 0.50,
        "balance_after": 50.50,
        "description": "Workspace wallet top-up",
        "created_at": "2026-04-13T10:00:00.000Z"
      }
    ],
    "pagination": {
      "current_page": 1,
      "per_page": 10,
      "total_records": 5,
      "total_pages": 1
    }
  }
}