klaviyo

Troubleshooting

If requests fail, run zero doctor check-connector --env-name KLAVIYO_TOKEN or zero doctor check-connector --url https://a.klaviyo.com/api/accounts --method GET

Authentication

All requests require three headers:

Authorization: Klaviyo-API-Key $KLAVIYO_TOKEN
revision: 2026-04-15
accept: application/vnd.api+json

For write requests, also include content-type: application/vnd.api+json.

The revision header pins the API version. Bump to a newer date only when you need a new feature — older revisions stay supported.

Environment Variables