Shopify Plus Development
Shopify Plus development is the process of building on Shopify's enterprise plan: custom checkout logic with Checkout Extensibility, advanced subscription systems, higher API rate limits, and custom apps. Checkout Extensibility lets you add custom UI components, validation logic, and subscription upsells directly in checkout, which standard Shopify plans do not allow.
Standard Shopify has a ceiling. When your subscription store needs custom checkout logic or higher throughput, Shopify Plus is where you need to be, and our Shopify Plus developers know how to build on it.
Live Client: Undy.dk
A complete Shopify Plus store with a 3-step custom subscription wizard, built from scratch with Appstle.
4,500
Active subscribers
Plus
Shopify tier
Fresh
Built from scratch
Also on Shopify Plus
5,000 subscribers migrated from WooCommerce to Shopify Plus with Appstle. Zero missed renewals.
5,000
subscribers
Shopify Plus clients
9,500+
Active subscribers across the Shopify Plus stores we built
8+ yrs
Our longest Shopify Plus client relationship (Driftaway Coffee)
Since 2013
Building on Shopify
380+
Projects launched across Shopify and Shopify Plus
Standard Shopify vs Shopify Plus
The decision to move to Plus isn't about prestige. It's about whether your subscription store needs capabilities that standard Shopify plans don't have.
| Capability | Standard Shopify | Shopify Plus |
|---|---|---|
| Custom checkout UI and logic |
Not available in checkout
|
Full Checkout Extensibility |
| Subscription upsells at checkout |
Not available
|
Built with checkout extensions |
| Age verification and custom fields at checkout |
Not available
|
Built with checkout extensions |
| API rate limits |
Standard limits
|
Up to 10x higher |
Checkout Extensions
Checkout extensions replace the old checkout.liquid customization. They run natively inside Shopify Plus checkout, so they don't break when Shopify updates.
Offer one-time buyers a subscription option at checkout, showing the saving per delivery and making the switch a single click. It turns one-time purchases into recurring revenue without leaving checkout.
Plus onlyRequired for wine, spirits, and other age-restricted subscription products. We build the age check into Shopify Plus checkout and tie it to the subscriber's account, so they don't see it on every order.
Plus onlyCapture delivery instructions, pet names, gift messages, or dietary requirements at checkout and attach them to the subscription order. The data passes to your fulfillment system automatically.
Plus onlyLet subscribers choose their first delivery date or a preferred delivery window at checkout. It works from your dispatch schedule and blocks dates you don't ship.
Plus onlyGift subscriptions, packaging notes, and engraving instructions captured at checkout and stored against the order. The data lives in Shopify, with no third-party gift app.
Plus onlyShow membership tier, loyalty points balance, and member savings inside checkout for logged-in subscribers, at the moment they are paying.
Plus only
What We Build
From fresh store builds to custom Shopify Plus development on a store you already run.
We build complete Shopify Plus stores from scratch: theme, subscription system, checkout extensions, custom apps, and integrations. Undy.dk is a Plus store we built from the ground up, with a 3-step subscription wizard and a custom subscriber portal. It now serves 4,500 active subscribers.
Moving from standard Shopify to Plus keeps your store data and subscribers in place. The development work is in building the checkout customizations Plus makes possible, moving workarounds such as cart-page fields and upsells into checkout, and enabling the Plus features your subscription app can now use.
Custom checkout logic built on Shopify's Checkout Extensibility framework. This is what makes Shopify Plus worth the investment for subscription brands, and it takes specialist development to get right.
Recharge, Appstle, and Shopify Subscriptions can do more on Plus, with access to checkout extensions and higher API limits. We integrate your subscription app at the Plus tier, including checkout hooks that aren't available on standard Shopify. Undy.dk runs Appstle on Plus with a custom wizard we built on top.
Live Shopify Plus Build
Appstle · Fresh Store Build
Undy.dk sells bamboo underwear subscriptions. They needed a new Shopify Plus store, not a migration, with a custom subscription wizard that guides customers through size, quantity, and color selection and a sock cross-sell in a single setup flow. Standard Shopify with an off-the-shelf subscription app couldn't handle that wizard logic.
Undy.dk started on Shopify Plus from day one because the wizard needed checkout-level customization. The cross-sell logic and subscription attribute handling needed the API access and Checkout Extensibility that only Plus provides. Starting on standard Shopify and upgrading later would have meant building the checkout work twice.
A Shopify Plus subscription store with 4,500 active subscribers. The 3-step wizard makes a multi-variant subscription simple to set up, and billing underwear and socks as one subscription keeps fulfillment and operations manageable as the subscriber base grows.
Why Codingkart
Undy.dk: 4,500 subscribers on a Plus store we built from scratch. Driftaway Coffee: 5,000 subscribers migrated from WooCommerce to Shopify Plus in two weeks with zero missed renewals. Two different build types in two different verticals, both live.
Most Shopify agencies know how to configure apps. Checkout extensions are a separate development discipline, built on Shopify's Checkout Extensibility framework. Our Shopify Plus developers build them as standard, not as an add-on.
We don't recommend Shopify Plus to every client. We recommend it when your subscription store needs what Plus provides: checkout extensions and higher API limits. If standard Shopify handles your requirements, we'll tell you.
Shopify Plus stores evolve: new products, new markets, new checkout requirements. We build systems that are maintainable, documented, and extensible. Undy.dk was built to scale, not just to launch.
How Projects Run
Five steps. Nothing starts until the scope is agreed.
We identify what Plus unlocks for your store (checkout extensions, API limits, subscription logic) and what needs to be built.
We review your store, subscription app, and checkout customizations before proposing a technical approach.
Clear scope, cost, and timeline. Which checkout extensions, which subscription app, and how it all connects.
All checkout extensions and subscription logic are tested in a Plus staging environment before go-live.
We manage go-live and monitor the first billing cycle on the new platform.
FAQ
A Shopify Plus development agency, or development company, builds and customizes stores on Shopify's enterprise plan. The work covers checkout extensions, custom apps, subscription systems, integrations, and upgrades or migrations to Plus. We do this for subscription brands.
Yes — Undy.dk is exactly that. A fresh Shopify Plus store designed, built and launched from nothing, with a 3-step subscription wizard on Appstle, a custom subscriber portal, and a sock cross-sell billed as a single unit. It started on Plus from day one because the wizard needed checkout-level customization; building on standard Shopify first would have meant doing the checkout work twice.
Yes, and the upgrade itself preserves your store data and subscribers — the real work is rebuilding checkout customizations. Anything that relied on checkout.liquid has to be rewritten as Checkout Extensions, and Plus-specific capabilities your subscription app can now reach need to be switched on deliberately. We scope that rebuild before you commit, so the cost of the move is clear up front.
A Shopify Plus build usually takes 6 to 12 weeks, depending on scope. A focused piece of work like a checkout extension or a custom app sits at the lower end. A full store build or a migration with custom subscription logic and integrations runs longer. We confirm the timeline after a scoping call, once we know your requirements.
It depends on whether you need a fresh store, an upgrade from standard Shopify, or checkout extensions added to an existing store. The scope review is free, and you get a clear scope, cost, and timeline before you commit to anything.
Related Services
Get Started
Whether you're building fresh on Plus, upgrading from standard Shopify, or adding checkout extensions to an existing store, start with a free scope conversation.
