---
title: "Checkout Add-on Upsell"
slug: "checkout-add-on-upsell"
description: "Boost your Shopify Plus store with the Checkout Add-on Upsell, showcasing tailored upsell offers directly at checkout for enhanced customer experience."
updated: 2025-11-11T16:43:58Z
published: 2025-11-20T21:39:53Z
canonical: "help.skio.com/checkout-add-on-upsell"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.skio.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Checkout Add-on Upsell

## Before you start

- To use the Checkout Add-on Upsell, you’ll need to have [Smart Upsell](/help/docs/smart-upsell) enabled and configured with rules.
- Make sure your store is on **Shopify Plus**. Advanced checkout customization is only available with Shopify Plus plans. You can learn more in the [Shopify checkout customization guide here](https://help.shopify.com/en/manual/checkout-settings/customize-checkout-configurations/checkout-apps#availability).

## What is the Checkout Add-on Upsell?

The Checkout Add-on Upsell is a Shopify Checkout Extension that lets you show upsell offers directly on the checkout page. Instead of managing logic inside the extension, it uses the **Smart Upsell** rules you’ve already set up in the Skio app so you can reuse the same logic from your customer portal at checkout.

## How it works

The extension automatically pulls upsell offers from your existing **Smart Upsell** settings in Skio. The same product rules used in the customer portal will apply at checkout.

> [!NOTE]
> **Note**
> 
> If you prefer not to use Smart Upsell, you can configure the extension to pull upsell products from a **Shopify Collection** instead.

## How do I set up the Checkout Add-on Upsell?

### Step 1: Open your Shopify Checkout settings

1. Log in to your Shopify admin.
2. Click **Settings** in the bottom-left corner.
3. Select **Checkout** from the left-hand menu.

### Step 2: Customize your checkout theme

1. In the **Configurations** section, find **Checkout theme**.
2. Click **Customize** next to your active theme.

![](https://cdn.us.document360.io/a953bba6-c70d-43ce-bc77-d7f32a8fc514/Images/Documentation/40044793226395.jpg?sv=2026-02-06&spr=https&st=2026-10-13T22%3A21%3A44Z&se=2026-10-13T23%3A21%3A44Z&sr=c&sp=r&sig=dwghlzsP1g%2FDuTxl%2Fnc8LA43%2F%2Bg0WLasrS4x4yXkWc4%3D)

### Step 3: Add the upsell app block into the checkout

1. In the checkout and accounts editor, scroll down the left-hand panel to **Order summary**.
2. Click **Add app block**.
3. Select the **Checkout Add-on Upsell** block from the list.

### Step 4: Configure the upsell block settings

Once added, a settings panel will appear. You can configure the following options:

- **Title:** The default heading above upsell products is **"You might also like"**.
- **Max product count:** Sets the maximum number of upsell products shown in the checkout block, up to **5**.
- **Use Smart Upsell:**
  - Select **true** to use Skio’s Smart Upsell feature.
  - Select **false** to use a [Shopify collection](https://help.shopify.com/en/manual/products/collections) instead:
    1. Go to your Shopify admin.
    2. Click **Products** > **Collections**.
    3. Open your chosen collection.
    4. Copy the last 12 digits from the URL (`yourstore.myshopify.com/collections/461417879636` or `admin.shopify.com/store/youstore/collections/461417879636`).
    5. Paste this number into the collection field.
- **Preselect subscription purchase:** Select true to automatically choose the subscription option for the product by default.
- **Allow one-time purchase:** Select true to let customers choose between a subscription or a one-time purchase.

### Customer experience at checkout

Clicking the **Add** button instantly adds the product to the customer’s order and updates the checkout total in real time.

![](https://cdn.us.document360.io/a953bba6-c70d-43ce-bc77-d7f32a8fc514/Images/Documentation/40044793227547.gif?sv=2026-02-06&spr=https&st=2026-10-13T22%3A21%3A44Z&se=2026-10-13T23%3A21%3A44Z&sr=c&sp=r&sig=dwghlzsP1g%2FDuTxl%2Fnc8LA43%2F%2Bg0WLasrS4x4yXkWc4%3D)