---
title: "Changes to Convert an optional block to tentative when its booking window opens."
method: PUT
path: "/booking/v1/block-actions/{id}/start-optional"
---

# Changes to Convert an optional block to tentative when its booking window opens.

`PUT /booking/v1/block-actions/{id}/start-optional`

> Every recorded change to this operation, newest first.
> 6 revisions in range; 1 not diffed.

## Timeline

Changed in 1 of 6 revisions.

- **2026-09-01** `6510a7df7143`: 1 info

## Changes

- **2026-09-01** `6510a7df7143`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/apaleo/apis/apaleo-booking-api/docs/booking/v1/block-actions/:id/start-optional/put.md) - [API](https://skmtc.dev/apaleo/apis/apaleo-booking-api.md) - [Page](https://skmtc.dev/apaleo/apis/apaleo-booking-api/changes/booking/v1/block-actions/:id/start-optional/put)