---
title: "Undo event ticket check-in."
method: POST
path: "/events/{event_id}/undo_check_in/tickets"
tags: ["Events"]
---

# Undo event ticket check-in.

`POST /events/{event_id}/undo_check_in/tickets`

Use this endpoint to undo check-in for one or more tickets, marking them as not checked in. The event must be in `ACTIVE` or `COMPLETE` status.

## Path parameters

- `event_id` string, required

## Request body

- OrderTicketKeysRequestDto — Request payload for ticket check-in operations.
  - `order_ticket_keys` string[], required — Array of order ticket keys to process.

## Response `204`

Successfully undone check-in for order tickets.

## Other responses

- `400` — Bad request. Either the JSON was malformed or there was a data validation error.
- `401` — The Access Token used is invalid.
- `403` — Forbidden request. You lack the necessary scopes, you lack the necessary user privileges, or the application is deactivated.
- `404` — The requested resource was not found.
- `500` — There was a problem with our internal service.

---

[API](https://skmtc.net/cc/apis/appconnect-v3.md) · [All operations](https://skmtc.net/cc/apis/appconnect-v3/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/cc/appconnect-v3/revisions/4b4a534c818d/schema)