Checkout Extensibility Build
Checkout UI extensions for trust content, delivery choice, gifting and post-purchase upsell. Native, upgrade-safe, and no longer dependent on checkout.liquid.
Scale · Checkout extensibility, B2B, subscriptions and Hydrogen builds
You already pay for Plus. Use the other four-fifths
Checkout UI extensions, Shopify Functions, native B2B, multi-market routing and Hydrogen storefronts. The Plus-only capabilities that sit on your invoice switched off — worth +22% AOV from checkout upsells and 14 hours a week off your ops team on recent builds.
The problem
Signs you have outgrown standard Shopify
- You pay for Plus but your checkout is still whatever the theme shipped with.
- Wholesale runs on a spreadsheet, a discount code and someone's inbox.
- Every new market means another store, another theme, another set of redirects.
- Your ERP sync is a nightly CSV that breaks the moment someone renames a column.
Shopify Plus is not a bigger theme. It is a different surface: checkout you can extend, discount and shipping logic you can write yourself, native B2B, and a Markets layer that runs twelve countries from one admin. Most brands pay for Plus and use about a fifth of it.
We build the fifth you are missing. Post-purchase upsells inside checkout, tiered wholesale pricing without a second store, subscription logic that survives a payment failure, and where the case genuinely justifies it, a Hydrogen storefront on Oxygen with sub-second navigation and full SEO parity.
Median result across Plus & Headless engagements. Individual outcomes vary with baseline, budget and category.
Scope
What you actually get
No line item here is optional-extra padding. This is the standard shape of the engagement.
Shopify Functions
Custom discount, delivery and payment-method logic written as Functions. Volume tiers, bundle pricing and B2B rules run server-side instead of via three stacked apps.
B2B on Shopify
Company profiles, price lists, payment terms, quantity rules and a self-serve reorder portal. Wholesale and DTC on one catalogue, one inventory, one admin.
Shopify Markets & Localisation
Multi-currency, multi-language, market-specific catalogues, domain routing and correct hreflang. Expansion without a store-per-country sprawl.
Headless Hydrogen Storefront
Hydrogen on Oxygen with the Storefront API, edge caching and streaming SSR. We build this only when the performance or content case is real, and we say so when it isn't.
ERP, PIM & 3PL Integration
NetSuite, Business Central, Akeneo or a 3PL wired in through a documented middleware layer with retry logic, error alerting and a reconciliation report.
How it runs
The engagement, step by step
You will always know what week you are in and what lands next.
Technical Discovery
We map your systems, order flows and edge cases end to end, then document where data breaks today. Output is an architecture diagram you can hand to any engineer.
Solution Design
Native-versus-custom decision for every requirement, with cost and maintenance load attached. Plenty of requests get answered with a $0 native setting.
Build in Sprints
Two-week sprints in a dev store with a staged demo at the end of each. You see working software every fortnight, not a status deck.
Load & Failure Testing
Peak-traffic simulation, payment-failure paths, partial-sync recovery and a rollback plan. We break it in staging so BFCM doesn't break it live.
Launch & Enablement
Phased rollout, monitoring dashboards and training for ops and finance. Every custom component ships with a README and a named owner.
Quoted per engagement, never off a rate card
We do not publish a price for this, because the honest number depends on your catalogue, your stack and how much of the work is already done. You get a fixed statement of work with named deliverables and named dates before anyone starts — and we will tell you plainly if this is not the right first move for your brand.
Get this scopedTools we run this on
Shopify PlusHydrogen + OxygenStorefront APIShopify FunctionsCheckout UI ExtensionsShopify MarketsRechargeNetSuite
Proof
Plus & Headless, in the wild
Anonymised at the client’s request. Metrics come straight from their own dashboards.
All case studiesSupplements (Subscription DTC)
~$4.2M/yr, 60% subscription revenue, 22 SKUs, US · Shopify Plus (Recharge, Klaviyo)
Monthly subscription churn hit 9.4% and the cancel flow was a single button on a hosted page nobody had touched in three years. Support processed 340 subscription changes a month by hand because customers could not do it themselves. The named constraint: no forced logins. The brand refused to gate account access behind a password reset, which ruled out every off-the-shelf portal.
9.4% → 6.1%monthly subscription churnheld for five consecutive months, not a single-month dip
+34%12-month customer LTV$187 to $251 on the subscriber cohort
19% → 38%of revenue from email + SMScategory benchmark for a healthy program is 25-40%
-71%subscription support tickets340/mo to 98/mo after the self-serve portal launched
What we did
- Built a passwordless, on-theme subscription portal on Shopify customer accounts. Skip, swap, delay and change frequency without a support ticket.
- Replaced the cancel button with a save flow: pause, downgrade cadence, or a one-time offer, ordered by predicted save rate rather than by margin.
- Rebuilt the Klaviyo flow set from 6 to 17, including a pre-billing notice, four-touch failed-payment dunning, winback, and an RFM-segmented replenishment series.
- Added a post-purchase bundle upsell through Shopify checkout extensions with a 90-day supply option at a per-unit discount.
“The portal paid for itself in support hours inside one quarter. The churn number is what actually changed the business.”COO, Supplements DTC
Home Goods & Furniture
~$11M/yr, 2,300 SKUs, configurable upholstery, US · Shopify Plus + Hydrogen storefront (Oxygen)
Fabric, leg and size options turned 2,300 SKUs into more than 40,000 variant permutations, and the Liquid theme rendered a configurable PDP in 6.9 seconds on mobile. Collection filtering ran client-side, so 40% of shoppers left before the first product painted. The named constraint: the ERP stayed. It was the single source of truth for stock and lead times and was not up for replacement.
6.9s → 1.4smobile LCP75th-percentile field data on configurable PDPs
+64%CVR on configurable products0.44% to 0.72%. Sitewide conversion rate rose 23%
+52%organic sessionsserver-rendered facets made 1,900 filter combinations indexable for the first time
+$2.4Mincremental annualized revenuemonth-8 run rate vs. the pre-build baseline
What we did
- Ran the paid growth audit first. Session recordings, funnel analysis and a prioritised revenue roadmap put configurator latency at #1. The redesign the client walked in asking for ranked #7.
- Built a Hydrogen/Oxygen storefront with server-rendered faceted collection pages and an edge-cached configurator.
- Integrated the existing ERP through a middleware layer for real-time stock and per-SKU lead times on the PDP. No ERP replacement, no data migration risk.
- Preserved the full URL structure and rebuilt product and breadcrumb schema so the headless cutover carried zero SEO debt.
“We came in wanting a redesign. The audit told us our problem was a six-second page. They talked us out of the thing we were ready to pay for.”VP Digital, Home Furnishings Brand
In their words
What clients said afterwards
Reorder time 20 min → 3 min
“We sell wholesale into about 400 accounts and were still taking reorders by email like it was 2009. They built the B2B catalog on Shopify with net-30 terms and per-account price lists, and moved our whole rep team onto it in one week. Average reorder went from roughly 20 minutes of back-and-forth to under three.”
Director of WholesaleFood & beverage brand, ~$22M/yr · Dallas, TX
Verified client, 2025LCP 4.1s → 1.3s
“A Hydrogen build plus a NetSuite sync that our own team had failed at twice. Inventory finally matches between the warehouse and the storefront, which sounds boring and is the most valuable thing anyone has done for us this year. LCP went from 4.1s to 1.3s. The honest part: the first six weeks felt slow and I genuinely wasn't sure we'd picked right — it only clicked once we moved to a standing Thursday call with the engineers instead of account-manager summaries.”
CTOJewelry brand, ~$18M/yr · New York, NY
Verified client, 2026FAQ
Plus & Headless — straight answers
Usually not. A well-built Liquid theme hits sub-2s LCP and costs a fraction to run. Headless earns its keep when you need a custom front-end framework, a heavy CMS-driven content layer, or interactive product configuration Liquid cannot serve. We will talk you out of it if the numbers don't hold.
No. Shopify has retired it in favour of checkout extensibility, and anything still running on it is on borrowed time. We migrate custom checkout logic into checkout UI extensions and Functions, which survive platform upgrades instead of blocking them.
For most mid-market brands, yes. Company accounts, per-company price lists, net payment terms and quantity rules cover the majority of wholesale workflows natively. Where it falls short is complex quoting and contract pricing, which we handle with Functions or a light custom app.
Through a documented middleware layer, never point-to-point. Every sync gets idempotency keys, retry with backoff, dead-letter handling and alerting into your Slack. You also get a daily reconciliation report so a silent failure cannot run for a week.
For checkout extensions, B2B and Functions at scale, yes. Markets and headless work on standard Shopify too. If you are weighing the upgrade, we will model the fee against what you would actually unlock rather than guess.
We scope in phases and attach a number to each phase before you commit. The variables that genuinely move it are B2B, subscriptions, ERP integration and whether you go headless. You can stop after any phase.
By location
Shopify Plus & Headless Commerce where you trade
How we deliver Plus & Headless in each of the markets we work in — the local buying behaviour, the competitive set, and what changes because of it.
Miami, FLNew York, NYLos Angeles, CAShopify Plus & Headless Commerce in ChicagoPlus & Headless for Houston brandsDallas Plus & HeadlessAtlanta, GAAustin, TXPhoenix, AZDenver, COour Plus & Headless work in SeattleSan Diego, CAShopify Plus & Headless Commerce in AlbuquerqueWashington, DCPlus & Headless for Philadelphia brandsBoston Plus & HeadlessPlus & Headless for San Francisco brandsRiverside Plus & Headlessour Plus & Headless work in DetroitMinneapolis, MNPlus & Headless for Tampa brandsShopify Plus & Headless Commerce in St. LouisBaltimore, MDCharlotte, NCShopify Plus & Headless Commerce in Orlandoour Plus & Headless work in San AntonioPlus & Headless for Portland brandsPlus & Headless for Sacramento brandsPittsburgh Plus & Headlessour Plus & Headless work in Las VegasCincinnati Plus & HeadlessKansas City, MOColumbus, OHShopify Plus & Headless Commerce in TorontoLondon, UKSydney, NSWPlus & Headless for Dublin brandsPlus & Headless for Dubai brandsShopify Plus & Headless Commerce in SingaporeAmsterdam Plus & HeadlessShopify Plus & Headless Commerce in BerlinParis Plus & HeadlessMadrid Plus & HeadlessMilan Plus & HeadlessZurich, Switzerlandour Plus & Headless work in StockholmPlus & Headless for Copenhagen brandsIstanbul, Türkiye
Pairs well with
What usually comes next
These are the services clients most often add once this one is live.
01
Build
Shopify Store Design & Development
Custom Shopify and Shopify Plus storefronts designed around your catalogue, built in clean Liquid, and launched with a measured conversion baseline.
DTC brands doing $1M-$20M a year
02
Build
Replatforming & Migration to Shopify
Move to Shopify with your catalogue, customers, order history and organic traffic intact. Redirect parity is signed off before we touch DNS.
Magento 1 and 2 brands facing EOL
03
Scale
Shopify Apps & Ongoing Growth Support
A named Shopify developer and strategist on a fixed sprint cadence: app stack owned, theme kept clean, ranked backlog shipped every month. The first stabilisation pass typically cancels around $1,840/mo of redundant app spend.
Brands without in-house Shopify developers
Next step
Ready to talk about Plus & Headless?
Plus-tier engineering for brands that have outgrown a standard theme: checkout extensions, Shopify Functions, B2B, Markets and headless Hydrogen storefronts.
Shopify or Shopify Plus stores doing $150k/mo or moreFounder, CEO or eCommerce lead on the callNo deck and no pitch — we open your store instead
Prefer to write it out? [email protected] gets a real reply the same business day, Mon-Fri, 9am-6pm MT.