Review new and breaking changes to Klaviyo's APIs and SDKs.

Welcome to the Klaviyo API Changelog! Review new and breaking changes to Klaviyo's APIs and SDKs. Select a revision header from the table of contents on the right to review changes for a specific revision. To view API reference and guides for a specific revision header, select it from the version dropdown in the upper left menu.

Revision 2023-01-24

New endpoints

  • Tags: Use our new Tags API endpoints to create, read, update, and delete tags on various Klaviyo objects such as campaigns, flows, lists and segments. See the API reference documentation for more info.
  • Data Privacy - Request Profile Deletion: Use our new Data Privacy - Request Profile Deletion API endpoint to delete profiles with a provided identifier (i.e. profile_id, email, phone_number). See the API reference documentation for more info.


Breaking changes

  • Changed url path for Create Template Render from{id}/render/ to
  • Changed url path for Create Template Clone from{id}/clone/ to

Revision 2022-10-17

  • Welcome to our new API changelog! This log will be kept up-to-date on the latest changes, bug fixes, and breaking changes to Klaviyo's APIs. Please note that this changelog only includes changes to new APIs released after 10/19/2022.
  • For further information about revisions and breaking changes, please review the API versioning & deprecation policy.
  • Kickstart your migration to Klaviyo's new APIs with the API comparison chart, a detailed overview of what's changed from the v1/v2 endpoints to the new endpoints.

Update 2023-01-20

  • The list_id attribute for the Unsubscribe Profiles endpoint is now an optional attribute instead of a required.

Update 2023-01-11

  • The Create Profile and Update Profile endpoints now accept a phone number as an identifier even if SMS is not set up in the associated Klaviyo account. A successful call requires one other profile identifier attribute (email, external_id, or anonymous_id), in addition to a phone number.

Update 2022-12-19

  • The reference documentation and OpenAPI Spec (OAS) for the Create Template Render and Create Template Clone endpoints have been updated to reflect the correct required fields. This update resolves a minor bug in our documentation where a required field needed to call the endpoints successfully was missing. No changes have been made to these endpoints.

Update 2022-11-02


Breaking change

  • Removed the updated filter parameter from the Get Profiles endpoint. This filter parameter was not intended for GA release and is not officially supported.
  • This change takes effect immediately due to site reliability concerns. Please refer to the breaking change policy for more information.