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

{
  "ok": true,
  "data": {
    "items": [
      {
        "id": "card_mno345",
        "customerId": "cus_abc123",
        "type": "virtual",
        "status": "active",
        "last4": "4242",
        "expirationMonth": 12,
        "expirationYear": 2027,
        "spendingLimit": {
          "amount": 5000,
          "frequency": "per24HourPeriod"
        },
        "createdAt": "2025-01-15T13:00:00Z"
      }
    ],
    "nextCursor": "<string>"
  }
}