---
title: "Klaviyo API changes, deprecations and deadlines | Harbyn"
description: "Klaviyo: 0 upcoming deadlines and 6 recorded changes as of 2026-10-25, each with its source."
canonical: "https://harbyn.com/vendors/klaviyo"
last-updated: 2026-10-25
---

# Klaviyo: API changes and deadlines

Markdown version of <https://harbyn.com/vendors/klaviyo>.

Messaging. 0 upcoming deadlines, 6 recorded changes. Every entry cites the Klaviyo page we read it from.

## What we read

The Klaviyo pages and feeds our ingestion visits, politely and on a schedule.

- **Changelog**: <https://developers.klaviyo.com/en/docs/changelog_>
- **Deprecations**: <https://developers.klaviyo.com/en/docs/api_versioning_and_deprecation_policy>
- **Changelog**: <https://api.github.com/advisories?affects=klaviyo-api&per_page=20&sort=published&direction=desc>

## What the scanner looks for

How `harbyn scan` recognises Klaviyo in a repository, on your machine. Nothing leaves it.

- **Packages**: `npm klaviyo-api`, `pypi klaviyo-api`
- **API hosts**: `a.klaviyo.com`

## Upcoming deadlines

No upcoming Klaviyo deadline in the feed right now.

## Change history

Newest first, by the date Klaviyo announced it. This is the archive: past changes are not warnings, and changes we recorded after they took effect are marked as such.

### October 2026

- Oct 15, 2026, Feature: [Beta revision 2026-10-15.pre adds Folders, Locations, Applications, Social Reporting, Managed DNS and K-SQL Ask APIs](https://developers.klaviyo.com/en/docs/changelog_)
- Oct 15, 2026, Feature: [Beta Forms API adds In-App form support](https://developers.klaviyo.com/en/docs/changelog_)
- Oct 15, 2026, Feature: [API revision 2026-10-15 makes Brands, Text Messaging and Translations APIs generally available](https://developers.klaviyo.com/en/docs/changelog_)
- Oct 15, 2026, Breaking change: [Custom Objects beta APIs change shape at revision 2026-10-15.pre](https://harbyn.com/changes/klaviyo/2026-10-15-custom-objects-metadata-and-record-apis-change-shape-in-beta.md) (effective Oct 15, 2026)
- Oct 15, 2026, Breaking change: [Revision 2026-10-15 replaces Campaigns API request and response shapes with the omnichannel model](https://harbyn.com/changes/klaviyo/2026-10-15-omnichannel-campaigns-api-changes-campaign-request-and-response-shapes.md) (effective Oct 15, 2026)
- Oct 15, 2026, Breaking change: [Revision 2026-10-15 changes the universal content display\_options shape](https://harbyn.com/changes/klaviyo/2026-10-15-universal-content-display-options-has-a-new-shape.md) (effective Oct 15, 2026)