Create one-time bill item

curl --request POST \
  --url https://api.helloproper.com/one-time-bill-items \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "leaseId": "<string>",
  "oneTimeBillItem": {
    "productKey": "<string>",
    "description": "<string>",
    "amount": {
      "currency": "<string>",
      "amount": 123
    },
    "quantity": 123,
    "dueDate": "<string>",
    "accountingPeriod": "<string>",
    "vat": {
      "taxMode": "<string>",
      "taxRate": 123
    }
  }
}'

{
  "oneTimeBillItemId": "<string>",
  "dueDate": "<string>"
}