Custom Objects are Klaviyo objects that can accept any schema and that can include a foreign-key reference to any Klaviyo profile object. While our other record types (profiles, events, campaigns, etc.) have fixed schemas (eg, a profile has first name, last name, email, location, accepts marketing, etc.), and while some, like profiles, can accept custom fiel

Get a foundational understanding of API calls and how the Klaviyo APIs can benefit your business. In this guide, you will learn about REST APIs, HTTP methods, and developer tools to prepare you for testing Klaviyo's APIs. Your first API calls can be accomplished in as little as 10 minutes from start to finish. If you are already familiar with API calls and a

Learn how to access your browser's developer console, which is a tool standard to most modern web browsers that logs page errors and warnings. The developer console can be helpful for debugging technical issues.

Learn how to manually import historical event data to Klaviyo. While we recommend using Klaviyo-built integrations with platforms such as Shopify, Magento, and BigCommerce, and our API for custom integrations, it's also possible to add this data manually. A common example of this is adding historical purchase data from a previous ecommerce platform that Klav

Learn how to send test data to Zapier via a POST request when creating a webhook to send email and SMS consent to Klaviyo.

If you've built your own custom cart solution, or the ecommerce data you would like to track in Klaviyo is not yet supported by one of our pre-built integrations, you can integrate with Klaviyo using our JavaScript API , server-side API , and Custom Catalog integration.

The following guide will walk you through setting up and using the JavaScript API. If you are planning on a full ecommerce integration, please see this guide .

Klaviyo's APIs are designed to help users and developers alike integrate with Klaviyo.

Klaviyo's API documentation is hosted at https://www.klaviyo.com/docs . This page links to the various sections.

The following glossary is an overview of basic technical terms to familiarize yourself with when first learning about Klaviyo's APIs. Looking for a glossary of Klaviyo-specific terms? Check out our Klaviyo glossary .