SHOPIFY PLUS - CHECKOUT CUSTOMIZATIONS

The Checkout is Where Revenue is
Won or Lost. Build It Right.

Branded checkout experiences, custom UI components, post-purchase upsells, and order flow logic - built on Shopify's Checkout Extensibility, not deprecated workarounds.

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WHAT'S INCLUDED

Every Layer of Checkout
Customization Shopify Plus Allows.

Checkout Branding & UI

Full checkout visual alignment to your brand - custom colors, typography, logo placement, and layout using Checkout Branding API.

Custom UI Components

New UI blocks added to the checkout - gift message fields, delivery instructions, upsell offers, trust badges, and custom form elements.

Post-Purchase Extensions

Custom thank-you page experiences and post-purchase upsell flows built as native Checkout Extensions - no third-party app required.

Order Summary Customization

Product images, variant details, and custom messaging in the checkout order summary - configured via Checkout UI Extensions.

Checkout Validation Logic

Custom field validation, order rules, and error messaging built via Shopify Functions - for stores with complex ordering requirements.

Subscription & Payment Customization

Custom payment method display logic, subscription plan selection in checkout, and payment option filtering via Shopify Functions.

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WHO THIS IS FOR

The Right Fit for This Service.

You're on Shopify Plus and the checkout looks nothing like the rest of your store - different fonts, colors, and a layout that breaks the brand experience at the worst possible moment.

You want post-purchase upsells, gift message options, or custom fields in checkout - and you know the right way to build them is with Checkout Extensions, not a fragile script injection.

You're running complex order logic - B2B minimum order values, product restrictions, or custom payment conditions - that Shopify's default checkout can't enforce natively.

You've been using an app for checkout customization that keeps breaking on Shopify updates, and you're ready for a proper native implementation.

HOW WE WORK

Scoped, Built, and Tested Against
Real Checkout Flows.

  1. 01

    Requirements & Feasibility

    We review what you want to achieve against what Checkout Extensibility currently supports. We tell you what's possible natively, what requires Shopify Functions, and what isn't supported - before scoping a single hour of work.

  2. 02

    Design & Spec

    UI components designed in Figma where visual output is involved. Logic components documented in a technical spec. You approve before development starts.

  3. 03

    Extension Development & Sandbox Testing

    Built and tested in Shopify's checkout sandbox environment using real product and order data - not placeholder content.

  4. 04

    Staging Review & Production Deploy

    Final review on your staging store. Checkout flow tested end to end with real payment methods before production deployment.

THE WORK IN PRACTICE

What a Checkout Extension Project Looks Like.

Home & Gifting

Custom Checkout Extensions - DTC Brand, US

Brand wanted gift message fields, a post-purchase upsell for complementary products, and full checkout branding alignment. Previously using a script tag approach that broke on every Shopify update. Rebuilt entirely on Checkout Extensibility.

Checkout ExtensionsPost-PurchaseShopify PlusBranding

$8.40

additional revenue per order
via post-purchase upsell

HOW WE BUILD IT

The Stack Behind Every Checkout Build.

Checkout Extensibility

Checkout UI Extensions
Post-Purchase Extensions
Thank You Page Extensions
Checkout Branding API

Logic & Validation

Shopify Functions (Rust)
Payment Customization
Delivery Customization
Order Validation

Development

React
Remix
Admin GraphQL API
Shopify CLI

Tools

GitHub
Shopify Partner Dashboard
Checkout Sandbox
COMMON QUESTIONS

Questions About Shopify Plus Checkout Customizations.

1. What is Shopify Checkout Extensibility and why does it matter?

Checkout Extensibility is Shopify's official framework for customizing the Plus checkout - using Checkout UI Extensions for UI changes and Shopify Functions for backend logic. It replaces the deprecated checkout.liquid approach and is the only supported customization path on Shopify Plus. Extensions built on this framework survive Shopify updates, which script-based approaches don't.

2. What can actually be customized in a Shopify Plus checkout?

With Checkout UI Extensions you can add custom UI blocks - gift message fields, trust badges, upsell offers, custom form fields, and delivery instructions. With Shopify Functions you can customize payment method display, shipping rate logic, and order validation rules. With the Checkout Branding API you can align colors, fonts, and layout to your brand.

3. Is checkout customization only available on Shopify Plus?

Yes. Checkout UI Extensions, Shopify Functions for checkout, and the Checkout Branding API are all restricted to Shopify Plus plans. Standard Shopify merchants can use the Checkout Extensibility framework only for limited post-purchase extensions.

4. Can you build a post-purchase upsell without a third-party app?

Yes. Post-purchase upsells can be built natively as Post-Purchase Extensions using Shopify's Checkout Extensibility framework. This avoids the additional monthly cost and performance overhead of a third-party app, and the extension is far more stable as a result.

Ready to Build a Checkout
That Works as Hard as the Rest of Your Store?

Tell us what you need the checkout to do. We'll scope it and respond within 24 hours.

Get a Free Quote Or book a 30-min call