> For the complete documentation index, see [llms.txt](https://learn.fueled.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://learn.fueled.io/integrations/destinations/klaviyo.md).

# Klaviyo

## Overview

Fueled's Klaviyo destination helps your Klaviyo flows perform better with reliable server-side event tracking. Capture missed shopping events, recognize returning visitors using your own first-party data, and send cleaner customer data to Klaviyo so your flows, segments, and campaigns perform stronger.

## Key Features

### 1. Capture Missed Shopping Events 

Recover missed Add to Cart, Checkout, and Product View events with server-side tracking so more shoppers enter your highest-converting Klaviyo flows.

### 2. Recognize Returning Visitors

Connect returning shoppers to their existing Klaviyo profiles using your brand's own first-party data so automations continue working across multiple visits. 

### 3. Improve Data Quality

Send cleaner, more reliable customer and shopping data into Klaviyo with event deduplication and data quality controls that help keep profiles accurate. 

### 4. Build Better Segments & Personalization 

Power more accurate audiences with complete behavioral data so your campaigns and automations reach the right customers with more relevant messaging.

## Installation Instructions

### 1. Install the Fueled App from the Shopify Marketplace

If you haven't already, please make sure that you have installed the [Fueled App from the Shopify Marketplace](https://apps.shopify.com/fueled-attribution-suite). Installation instructions for enabling Fueled can be found here: <https://learn.fueled.io/apps/shopify>.

### 2. Enabling Fueled's Klaviyo Destination

Once Fueled has been installed for Shopify, visit the `Email & SMS` tab within the Fueled App UI to configure our Klaviyo integration.&#x20;

{% hint style="info" %}
If you installed the Fueled App after July 1st, 2026, you will only see our Klaviyo Oauth integration option. If you installed the App before July 1st, you will see an option to migrate from a Private API key integration to Klaviyo Oauth.
{% endhint %}

<figure><img src="/files/Wb2Sgpe7cfvCJGcvQroz" alt="Fueled Email and SMS Configuration Screen"><figcaption></figcaption></figure>

Select "Connect with Klaviyo" to begin the Oauth authentication process with your Klaviyo account.

If you have more than one Klaviyo account, you'll be asked to select the associated account:

<figure><img src="/files/jAW26wscXn0bFJDob0lo" alt="Select The Associated Klaviyo Account"><figcaption></figcaption></figure>

Then, approve the Fueled App's Klaviyo permissions request:

<figure><img src="/files/oC3XhAdv61nw16a5tVjO" alt=""><figcaption></figcaption></figure>

Once this is complete, you will return to the Fueled App in Shopify. Confirm that the Oauth integration is complete and that the Klaviyo Destination is enabled:

<figure><img src="/files/YaduRSBwAHfCEqoHmaiS" alt=""><figcaption></figcaption></figure>

### 3. Confirm Event Stream in Klaviyo

Once enabled, the Fueled app will start streaming server-side events into Klaviyo. Fueled events have the suffix `- SS`.

<figure><img src="/files/wi5VHqtF0tcYiUBNqtlU" alt="Confirmation of Fueled Server-Side Metrics in Klaviyo"><figcaption></figcaption></figure>

Once these events are streaming in Klaviyo, you can duplicate your standard "Abandonment Flows" in Klaviyo to fire emails based upon these server-side events.


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