curl --request PATCH \
  --url https://api.spacebring.com/billing/invoices/v1/items/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "invoiceItem": {
    "product": {
      "title": "<string>"
    },
    "quantity": 2,
    "unitAmount": 1
  }
}
'

{
  "message": "<string>",
  "type": "<string>"
}