curl --request GET \
  --url https://api.ledger.so/v1/transactions/{id} \
  --header 'Authorization: Bearer <token>'

{
  "ok": true,
  "data": {
    "id": "txn_pqr678",
    "customerId": "cus_abc123",
    "type": "card_spend",
    "status": "pending",
    "amount": 42.5,
    "currency": "USD",
    "createdAt": "2025-01-15T13:30:00Z",
    "merchantName": "Coffee Shop"
  }
}