---
title: "Start Sync"
method: POST
path: "/v1/subscriber_list/{list_id}/start_sync/"
---

# Start Sync

`POST /v1/subscriber_list/{list_id}/start_sync/`

Creates an empty draft version of the list where you can update users to be replaced without affecting the live version.

## Path parameters

- `list_id` string, required

## Response `201`

201

- object
  - `version_id` string — start sync creates a draft version of the list with version_id. Use this version to update users in the draft list.

## Other responses

- `400` — 404

## Changes

- **2026-08-20** `9a5a2cd152ae` — 1 breaking
  - added the pattern `^[a-z0-9_-]+$` to the `path` request parameter `list_id`

[Change history](https://skmtc.dev/suprsend/apis/suprsend-api/changes/v1/subscriber_list/:list_id/start_sync/post.md)

---

[API](https://skmtc.dev/suprsend/apis/suprsend-api.md) · [All operations](https://skmtc.dev/suprsend/apis/suprsend-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/suprsend/suprsend-api/revisions/ea7b2f7c41a9/schema)