Shopify Buy Button Developers for External Sites

The Shopify Buy Button is a sales channel for selling on a website or blog that isn't your Shopify store. You create a button for a product or a whole collection, style it in a visual editor, and paste the embed code into the other site. Shoppers buy without leaving that page, product details update from Shopify, and the sales appear in Shopify analytics. The channel is included in every Shopify plan. Simple buttons rarely need outside help. Merchants hire when the default look clashes with the host site, when they want a custom cart built with the Buy Button JS library, or when an old embed needs upgrading because Shopify deprecated the Checkout APIs it relied on. That work suits a front-end developer who knows Shopify's Storefront API. If nobody below suits a Buy Button job, the app integration and headless development specialists linked lower down build embeds and custom carts too. Before you brief anyone, gather the site platform, the URLs where buttons sit, roughly when the embeds were made, and whether any custom JavaScript is involved.

Buy Button channel

Experts for Shopify Buy Button

Michael Trang - Shopify & CRO Expert

PRO

CRO SpecialistWashington, United StatesFrom $125

5.00(5 reviews)

shopexpertsscore

Logging in from Austin, TX, I'm a seasoned eCommerce and Conversion Rate Optimization(CRO) expert with over 20 years of experience in the online space, with 12 of those years in ecommerce, helping brands scale and maximize profitability. As the founder of MHT Media, I've led hundreds projects, leveraging data-driven strategies to optimize customer journeys generating real revenue. Here are some brands I've worked with. • Giantmouse (Shopify Plus) • Mad Viking Beard (Shopify Plus) • BlackMask Products (Shopify Plus) • ClaimSimple (WooCommerce) • Pastest (Shopify Plus) • Spaze (Shopify Plus) • And Arlen (Shopify)...and many others!

Theme & App Skills

Buy Button channel

Shoplift – Split & A/B Testing

Visually – A/B Testing & CRO

Klaviyo

Tapcart ‑ Mobile App Builder

Aftersell Post Purchase Upsell

Consentmo GDPR Compliance

Infinite Product Options

Judge.me

Loox ‑ Visual Product Reviews

Loop Subscriptions

Gorgias

Shop Pay Installments

Shopify Flow

Smile

Privy

Attentive

Bold Subscriptions

Bold Upsell

Loop Returns

Matrixify

Okendo

Pixel Union

Triple Whale

Wishlist Plus

Yotpo

Archetype Themes

Out of the Sandbox Themes

We Are Underground Themes

Eight Themes

Horizon Theme

Judge.me Email Marketing

View Profile Get a Free Quote

What a Buy Button developer actually builds

Buy Button jobs come in two sizes, and they need different people. One is configuration: generate the code, style it, paste it. The other is development with the Buy Button JS library or the Storefront API, where the button turns into a custom product listing or cart on someone else's platform.

Embeds that look native. Building buttons for single products or full collections, then using the editor's fonts, colours and layouts so they match the host site's brand. Product changes made in Shopify flow through without anyone touching the embed again.

Custom components. Using Buy Button JS to place customisable Shopify UI, such as product listings and shopping carts, directly into any website. When a brand needs more control than the library gives, developers build against the Storefront API instead.

Rescue jobs. Upgrading old or hand-edited embeds after the Checkout API deprecation, and replacing anything built on the retired JS Buy SDK. These arrive with a deadline attached, because an embed that can't complete a purchase earns nothing.

Cart permalinks. Creating links that open a ready-made cart, for use in an email campaign, a direct message or a social post. A sensible expert ties each link to the products you actually promote and checks it still resolves after catalogue changes.

Reporting checks. Confirming that Buy Button sales show up in Shopify's Home sales overview and Analytics pages, so revenue from the external site isn't sitting outside your normal reporting.

Configurator or developer: who your Buy Button job needs

Work out which kind of job you have before you hire. Styling a couple of buttons needs care, not a developer. A custom cart, or a rescue after Shopify's API changes, needs someone who has shipped Storefront API code and can show it.

Ask which library they'd use. A capable developer knows the difference between Buy Button JS, which still works on its latest version, and the older JS Buy SDK, which lost support. If they blur the two, keep looking.

Ask where the buttons will live. Shopify cautions against using Buy Buttons on your own Shopify online store or blog. Someone who proposes that is solving the wrong problem; a theme section or app block usually fits better there.

Ask about payments. Buy Button needs a supported payment gateway. A good candidate checks yours before quoting, not after the first test order fails.

Start with an embed audit. A small paid task: list every live embed, where it sits, roughly when it was created and which library it loads. You get an inventory you need anyway, and you see how the person documents their work.

Shopify Buy Button SDK and API changes to check

The old SDK stopped selling. Shopify discontinued support for the JS Buy SDK. Sites that hadn't migrated could no longer complete purchases after 1 July 2025, and Shopify points developers to the Storefront API Client instead. If a custom shop on another site went quiet in mid-2025, start here.

Buy Button JS needs its latest version. The library depended on Shopify's Checkout APIs, which Shopify deprecated. To keep working, any page loading Buy Button JS has to run the latest version. An expert checks the version on every page that uses it, including landing pages nobody has opened in years.

Shopify Support won't debug it. Buy Button JS isn't covered by Shopify Support. Shopify sends developers to its community and to Shopify Partners for help instead, so any custom build needs a named person you can go back to when it breaks.

Buttons from before October 2016 are dead. Buy Buttons created before 10 October 2016 are no longer supported. Old blog posts, press pages and partner sites are where they tend to survive, still showing a button Shopify no longer supports.

The editor isn't the whole story. The visual editor covers fonts, colours and layouts. Anything beyond that, such as a different cart behaviour or a product grid that filters, is library or API work and should be scoped as development.

Buy Button projects merchants bring to a developer

The first and last of these are configuration; the three in between are development work.

Branded product embeds

Buttons for single products or collections styled to the host site's fonts and colours

Custom cart on another site

Product listings and a shopping cart built with Buy Button JS

Old SDK replacement

Rebuilding shops that ran on the JS Buy SDK with the Storefront API Client

Embed version audit

Finding every live embed and bringing Buy Button JS up to its latest version

Campaign cart links

Cart permalinks for email campaigns, direct messages and social posts

Shopify Buy Button: questions before you hire

How do I use the Shopify Buy Button on a site that isn't Shopify?

Add the Buy Button sales channel in your Shopify admin, create a button for a product or collection, and adjust the look in the editor. Copy the generated HTML and paste it wherever your platform accepts custom code. Place a real test order on the host site before you announce anything, and check it lands in Shopify.

Is there a Shopify Buy Button plugin?

Not as such. The channel gives you HTML embed code to paste into your platform of choice, so there's nothing to install on the host site for a standard button. Developers who need more than the generated code use the Buy Button JS library or build directly on the Storefront API.

Is there a charge for the Buy Button channel?

The channel is included in all Shopify subscription plans, so there's no separate charge for it. You need an active plan and a supported payment gateway. Expert costs depend on the job: styling some buttons is small work, while a custom cart or an SDK replacement is a development project with testing attached.

Should a developer use Buy Button JS or the Storefront API?

For components dropped into a page, such as a product listing or a cart, Buy Button JS on its latest version. For a fully custom experience, the Storefront API, using Shopify's Storefront API Client where older code used the JS Buy SDK. A good developer explains which one fits your site, and why, before writing code.

What should I hand a developer before a Buy Button fix?

A list of every page carrying a button, admin access to the host site, a collaborator or staff account on Shopify, and a cheap test product you don't mind ordering. If custom JavaScript was ever written for the shop, send the file or repository that holds it. The faster they see the code, the shorter the audit.