curl --request GET \
  --url https://api.helloproper.com/recurring-bill-items \
  --header 'Authorization: <api-key>'

{
  "recurringBillItems": [
    {
      "id": "<string>",
      "ownerId": "<string>",
      "leaseId": "<string>",
      "created": "<string>",
      "modified": "<string>",
      "productKey": "<string>",
      "startedOn": "<string>",
      "cancelledOn": "<string>",
      "endedOn": "<string>",
      "billingCycle": {
        "timeUnit": "<string>",
        "periodLength": 123,
        "start": 123
      },
      "amountRecords": [
        {
          "id": "<string>",
          "value": {
            "currency": "<string>",
            "amount": 123
          },
          "start": "<string>"
        }
      ],
      "vatRecords": [
        {
          "id": "<string>",
          "value": {
            "taxMode": "<string>",
            "taxRate": 123
          },
          "start": "<string>"
        }
      ],
      "descriptionRecords": [
        {
          "id": "<string>",
          "value": "<string>",
          "start": "<string>"
        }
      ],
      "quantityRecords": [
        {
          "id": "<string>",
          "value": 123,
          "start": "<string>"
        }
      ]
    }
  ]
}