---
title: "List Billing Schedule Custom Field Keys"
method: GET
path: "/billing-schedule-custom-field-keys"
tags: ["Billing Schedules"]
---

# List Billing Schedule Custom Field Keys

`GET /billing-schedule-custom-field-keys`

List all distinct custom field keys across billing schedules for the current account.

## Headers

- `Authorization` string, required
- `sequence-version` '2024-07-30'

## Response `200`

OK

- ListBillingScheduleCustomFieldKeysResponse
  - `items` string[], required — Distinct custom field keys across all billing schedules

## Other responses

- `400` — Bad Request
- `401` — Unauthorized
- `500` — Internal Server Error

## Changes

> 714 revisions in range; 511 could not be searched.

- **2026-06-13** `02acff42af53` — 1 breaking, 1 warning, 1 info
  - added the new required `header` request parameter `Authorization`
  - deleted the `header` request parameter `Sequence-Version`
  - added the new optional `header` request parameter `sequence-version`

[Change history](https://skmtc.dev/sequencehq/apis/sequence/changes/billing-schedule-custom-field-keys/get.md)

---

[API](https://skmtc.dev/sequencehq/apis/sequence.md) · [All operations](https://skmtc.dev/sequencehq/apis/sequence/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/sequencehq/sequence/revisions/e520d2f95b7b/schema)