---
title: "Klaviyo Revision 2026-10-15 replaces Campaigns API request and response shapes with the omnichannel model | Harbyn"
description: "Klaviyo Revision 2026-10-15 replaces Campaigns API request and response shapes with the omnichannel model."
canonical: "https://harbyn.com/changes/klaviyo/2026-10-15-omnichannel-campaigns-api-changes-campaign-request-and-response-shapes"
last-updated: 2026-10-15
---

# Klaviyo Revision 2026-10-15 replaces Campaigns API request and response shapes with the omnichannel model

Markdown version of <https://harbyn.com/changes/klaviyo/2026-10-15-omnichannel-campaigns-api-changes-campaign-request-and-response-shapes>.

Breaking change - Klaviyo. low severity. In effect.

In revision 2026-10-15 the omnichannel Campaigns API becomes generally available and replaces the request and response shapes of Get Campaigns, Get Campaign, Create Campaign, Update Campaign, Create Campaign Clone and the campaign message endpoints. A campaign now holds audiences, each audience holds single-channel messages, and Get Campaigns no longer requires a channel filter. Campaign audience, variation and scheduling endpoints are also generally available. Earlier revisions are unaffected until upgraded; omnichannel beta users see no shape change.

The deadline passed on Oct 15, 2026.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [Klaviyo](https://harbyn.com/vendors/klaviyo.md) |
| Kind | Breaking change |
| Severity | low |
| Status | In effect |
| Announced | Oct 15, 2026 |
| Effective | Oct 15, 2026 |
| Added to Harbyn | Oct 15, 2026 |
| Lead time | Added on the day of the deadline |
| API versions (revision) | `2026-10-15` |
| Review | Reviewed by a person, extracted by a model |

## Find it in your code

```sh
npx harbyn scan
```

The scanner reads your repository on your machine and reports every file and line that uses the identifiers above. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://developers.klaviyo.com/en/docs/changelog_> (changelog, fetched 2026-10-15 17:07 UTC, sha256 `01d139e2f77e3a1d11324ffe05cb17966313e973a91e9e42b712e44406fcb0b7`)

## Related changes

### More from Klaviyo

- [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) (Breaking change, effective Oct 15, 2026)
- [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) (Breaking change, effective Oct 15, 2026)

### Changes at other vendors

- [Amazon Selling Partner API: October listing attribute usage and enumeration value updates](https://harbyn.com/changes/amazon-sp-api/2026-10-14-sp-api-updates-new-listings-items-api-ivp-values-in-eu5-jp-and-ca-stores-oct-2.md) (effective Oct 26, 2026)
- [Supabase: four CBC-mode TLS 1.2 cipher suites will be removed from project HTTP APIs](https://harbyn.com/changes/supabase/2026-10-12-an-outdated-subset-of-tls-1-2-ciphers-will-be-disabled-on-project-http-apis.md) (effective Nov 10, 2026)
- [Google Workspace APIs: OAuth clients must be marked as agentic to call Google Workspace MCP servers](https://harbyn.com/changes/google-workspace/2026-10-12-oauth-clients-must-be-marked-as-agentic-to-call-google-workspace-mcp-servers.md) (effective Nov 11, 2026)
- [Bitbucket Cloud API: Git Credential Manager upgrade required for OAuth 2.0 Git authentication](https://harbyn.com/changes/bitbucket/2026-10-13-git-credential-manager-upgrade-required-for-oauth-2-0-git-authentication.md) (effective Nov 30, 2026)

[All upcoming deadlines](https://harbyn.com/deadlines.md)