curl --request GET \
  --url https://app.flowglad.com/api/v1/invoice-line-items/{id} \
  --header 'Authorization: <api-key>'

{
  "id": "<string>",
  "createdAt": 0,
  "updatedAt": 0,
  "livemode": true,
  "invoiceId": "<string>",
  "quantity": -1,
  "priceId": "<string>",
  "description": "<string>",
  "price": -1,
  "type": "<string>",
  "ledgerAccountId": null,
  "ledgerAccountCredit": null
}