Buscar Fatura por ID

curl https://api.upag.io/v1/invoices/inv_abc123xyz \
  -H "Authorization: Bearer {token}"

{
  "id": "inv_abc123xyz",
  "customerId": "cus_ahwDXrgYvur89iPs",
  "paymentMethodId": "pm_abc123xyz",
  "currency": "BRL",
  "status": "open",
  "livemode": false,
  "number": "INV-001",
  "description": null,
  "dueDate": "2024-12-15T00:00:00.000Z",
  "paidAt": null,
  "amountDue": 9900,
  "amountPaid": 0,
  "attemptCount": 1,
  "subscriptionId": null,
  "items": [
    {
      "id": "ii_abc123xyz",
      "priceId": "price_def456ghi",
      "quantity": 1,
      "amount": 9900
    }
  ],
  "payments": [],
  "createdAt": "2024-11-15T10:00:00.000Z",
  "updatedAt": "2024-11-15T10:00:00.000Z"
}