Last updated: July 2026

What is an in-checkout upsell? An in-checkout upsell is an offer shown inside Shopify’s native checkout flow, before payment completes. Zipify One Click Upsell (OCU) adds up to 8 SKUs of in-checkout offers with split testing, built directly into Shopify’s checkout editor on Shopify Plus.

Why Do In-Checkout Upsells Matter for AOV?

Checkout is the highest-intent moment in the funnel. The customer has selected a product and entered payment, actively completing a purchase, so a single relevant add-on captures incremental revenue right when buying intent peaks. It’s available today on every Shopify Plus store.

How Do In-Checkout Upsells Work on Shopify Plus?

Zipify OCU’s In-Checkout Offer runs inside Shopify’s checkout. It supports:

  • Up to 8 SKUs, shown as a single relevant offer or a small choice set.
  • Split testing on product and offer content, to see which SKU and price point convert best at this step.

How to Set Up an In-Checkout Upsell With Zipify OCU

In-checkout is built into Zipify OCU, not a separate purchase or a second subscription. Some Shopify Plus upsell tools price checkout offers as an add-on or sell them through a dedicated app just for that placement. With Zipify OCU, it’s one of six placements included in the same plan, so there’s no extra app to install or additional setup to configure before it’s live.

  1. Install One Click Upsell from the Shopify App Store (30-day free trial).
  2. Add the In-Checkout Offer block inside Shopify’s checkout editor.
  3. Choose the trigger product(s) and select up to 8 SKUs to offer.
  4. Set the discount and confirm the offer is a single click to add.
  5. Run a test checkout before it goes live for real customers.

Where Do In-Checkout Upsells Fit in the Shopify Funnel?

Product Page: Product Page Offer Widget, up to 8 SKUs, split testing.

Slide Cart Drawer: Cart drawer replacement with free-shipping reward bar, up to 8 SKUs.

Pre-Purchase Popup: Single, upgrade, multi-product (up to 5 SKUs), same-product, and Dynamic AI offers.

In-Checkout (this guide): Up to 8 SKUs, split testing, built into Shopify Plus checkout.

Post-Purchase: One-click accept, single, multi-product, same-product, Dynamic AI, and downsell-on-decline.

Thank You Page: TY Page Offer, plus PostProfit (free built-in ad revenue feature).

Zipify OCU runs all six placements, including in-checkout, in one system. For the full picture, see the complete 2026 upsell playbook.

FAQ

Is it safe to add in-checkout upsells?

Yes. Zipify OCU is a Shopify Certified Technology Partner, and its In-Checkout Offer is built on Shopify’s own supported checkout extension framework, not a third-party workaround. 

Does an in-checkout upsell require Shopify Plus?
 Yes. In-checkout offers run on Shopify Plus, built into the checkout editor.

Does setting up an in-checkout upsell require a developer?
 No. Zipify OCU’s In-Checkout Offer installs and configures directly inside Shopify’s standard checkout editor.

How many products can I offer at checkout with Zipify OCU?
 Up to 8 SKUs, with split testing to see which products and offer content convert best.

Does the customer need to re-enter payment info to accept an in-checkout offer?
 No. The offer adds to the same order the customer is already completing, in one click.

Can I run in-checkout offers alongside pre-purchase and post-purchase offers?
 Yes. Zipify OCU runs all six placements, including in-checkout, pre-purchase, and post-purchase, in one funnel builder, each tracked and split-tested independently.

How much does Zipify OCU cost for in-checkout upsells?
 In-checkout is included in every Zipify OCU plan for Shopify Plus stores. Every plan includes a 30-day free trial.

Try One Click Upsell free for 30 days: Here. 

Sources: How to Upsell on Shopify in 2026, Zipify · Zipify OCU internal merchant database (15,000+ stores).