Shopify Functions Development Services

Need discount, shipping, payment or checkout rules that Shopify does not offer out of the box, or old Shopify Scripts logic to rebuild? Shero writes Shopify Functions as custom apps for tiered and bundle discounts, hidden or renamed delivery and payment options, checkout validation and order routing by warehouse.

Book a Discovery Call Our Work

16+

Years in business

500+

Projects Delivered

65+

Team Members

98%

Client Retention

5ms

Execution time for a Shopify Function

Shopify Functions compile to WebAssembly and execute on Shopify's own servers in under 5 milliseconds, with no cold starts during traffic spikes. Ruby Scripts were executed in a sandbox and could slow down under heavy load.

25

Maximum payment customization Functions active per store

Shopify Functions support up to 25 payment customization Functions per store simultaneously, enabling granular control across different customer segments, order types, and market conditions at the same time. Script Editor was limited to one payment Script at a time.

Cart Transform

Credit-only checkout in a custom app

Regal Crown Club members needed to buy rewards using only their loyalty credits, and Shopify's standard checkout could not accept that. We wrote a custom app that applies the credits and discounts on the cart page and charges the correct shipping.

June 30, 2026

The date Shopify Scripts stopped working

Shopify set June 30, 2026 as the end date for Shopify Scripts, so line item, shipping and payment Scripts now need to be Functions. We rebuild each Script as a Function in a custom app and test it against real carts as part of our checkout customization work.

Since partnering with Shero Commerce, our eCommerce revenue has grown by 200%. Their support and solutions have been game changers for our business.

James McKenna, Senior Commerce and CX Manager, STX

What Shopify Functions are and can do

Shopify Functions are compiled WebAssembly modules that execute at specific points in the commerce lifecycle: discount calculation, shipping logic, payment customization, cart transformation, and checkout validation. Shero writes and migrates across every Functions extension point Shopify Plus supports:

Script Editor to Shopify Functions migration for plus stores with existing Ruby Scripts
Custom discount Functions for tiered pricing, BOGO, and multi-condition promotional logic
Payment customization Functions for B2B payment gating and method ordering
Shipping customization Functions for zone-based logic, carrier filtering, and rate renaming
Cart Transform Functions for component-level bundle splitting and line item modification
Checkout Validation Functions for order condition enforcement and fraud prevention logic

Compared on	Shopify Functions development agency	A discount app from the App Store	A freelance developer	An in-house developer
Tiered wholesale pricing	Dealer price lists set up with Shopify B2B or an app, with custom code only where needed	Covers common tiers well	Writes a Function if no app fits	Learns Functions first
Purchase limits on product drops	Swag Golf: purchase limits set up for launches	Some apps handle simple limits	Custom Function, one person to maintain	Done once they learn the API
Hiding or renaming delivery and payment options	Delivery and payment customization Functions written to your rules	Prebuilt rules for common cases	Needs Rust or JavaScript plus Shopify CLI	Possible with time to learn
Blocking bad orders at checkout	Cart and checkout validation Functions that stop orders before payment	A few apps offer basic checks	Written to your list of rules	Done as time allows
How you pay	Paid discovery, then an accurate estimate.	A monthly app fee	Hourly	Salary

Shopify Functions development agency

Tiered wholesale pricing Dealer price lists set up with Shopify B2B or an app, with custom code only where needed

Purchase limits on product drops Swag Golf: purchase limits set up for launches

Hiding or renaming delivery and payment options Delivery and payment customization Functions written to your rules

Blocking bad orders at checkout Cart and checkout validation Functions that stop orders before payment

How you pay Paid discovery, then an accurate estimate.

Compared with

A discount app from the App Store

Tiered wholesale pricing Covers common tiers well

Purchase limits on product drops Some apps handle simple limits

Hiding or renaming delivery and payment options Prebuilt rules for common cases

Blocking bad orders at checkout A few apps offer basic checks

How you pay A monthly app fee

A freelance developer

Tiered wholesale pricing Writes a Function if no app fits

Purchase limits on product drops Custom Function, one person to maintain

Hiding or renaming delivery and payment options Needs Rust or JavaScript plus Shopify CLI

Blocking bad orders at checkout Written to your list of rules

How you pay Hourly

An in-house developer

Tiered wholesale pricing Learns Functions first

Purchase limits on product drops Done once they learn the API

Hiding or renaming delivery and payment options Possible with time to learn

Blocking bad orders at checkout Done as time allows

How you pay Salary

01

Scripts audited before any Functions code is written

Most Shopify Plus stores had Scripts that were written years ago by developers who have since left. Shero audits every Script the store relied on before starting any migration, categorizes each by replacement path (native Shopify feature, public app, or custom Function), and identifies dead logic that can be dropped entirely. The audit prevents rebuilding logic that is no longer serving a business purpose.

02

New Functions checked against past Script orders to confirm parity

Shopify allowed Scripts and Functions to work side by side until the June 30, 2026 cutoff. Since Scripts stopped, Shero puts sample carts through each new Function and compares the results with past orders placed under the old Script before launch. The failure mode most agencies miss is a Function that deploys successfully but returns no discount because a required field was left out of the GraphQL input query.

03

B2B pricing Functions that key to customer metafields

B2B pricing logic stored in customer metafields (wholesale tier, account type, region) cannot be expressed through Shopify's standard Discounts admin. A custom discount Function reads the customer metafield at checkout, applies the correct pricing tier, and returns the adjusted line item prices in under 5 milliseconds. This is the most common custom Function use case for wholesale and distribution brands on Shopify Plus.

04

Payment customization Functions for B2B payment gating and method ordering

Retail customers and wholesale accounts need different payment options at checkout. A payment customization Function reads customer tags or company account data and hides, reorders, or renames payment methods accordingly. Up to 25 payment customization Functions can operate simultaneously per store, covering different customer segments and order types at the same time.

05

Shipping Functions for carrier filtering, zone logic, and rate renaming

Hazmat products, PO box restrictions, carrier-specific rules for B2B accounts, and zone-based rate structures all require shipping logic that Shopify's standard shipping admin cannot express. A shipping Function receives the cart contents, delivery address, and customer data, applies the required logic, and returns the correct rates. For Alto Music, Shero wrote a delivery customization that shows or hides its two-day shipping method at checkout by product region and login status.

06

Custom development apps created through the Partner Dashboard, not the Shopify admin

Custom Shopify Functions for store-specific logic are deployed in a custom app, and only Shopify Plus stores can use custom apps that contain Functions. Shero writes Functions as properly structured apps, which means they are maintainable, testable, and deployable through Shopify CLI instead of depending on fragile admin customizations.

Digital products

Ordergroovedigital memberships with free trials and plan changes, connected through custom middleware

Stripesubscriptions and saved cards moved off Stripe at go-live

Shift WorshipShopify

Entertainment

Custom appcredit based checkout rebuilt in a custom Shopify app

+40%faster page loads than legacy Magento

Regal CinemasShopify

Read the case study

Backup camera systems

+32%Google clicks in the 12 weeks after the move from Magento

+65%Google impressions, same 12 weeks vs the 12 before

Camera SourceShopify

Read the case study

Lacrosse and Hockey Gear

STX

Looking to scale alongside growing global markets and competitor consolidation, the premium American manufacturer of lacrosse, field hockey, and ice hockey equipment, partnered with Shero to migrate from Adobe Commerce (Magento) to Shopify, delivering a unified D2C and B2B experience, custom ERP integration, and a refined storefront that reflects the engineering quality of their products.

STX

Premium Knives

Benchmade

For more than three decades, Benchmade has been known for producing high-quality knives for everyday carry, hunting, rescue, and outdoor use. Launched on Magento Commerce Cloud in 2018, the brand partnered with Shero to expand online amid rising outdoor consumer demand. Since then, they have seen: +100% revenue growth, +68% transaction growth after relaunch, and a +20% increase in average order value.

Benchmade

Musical Instruments

F-Musiikki

F-Musiikki is one of Finland's leading music instrument retailers, serving both consumers and businesses with over 15,000 products. Looking to reduce costs and modernize their platform, the brand partnered with Shero to migrate from Magento to Shopify Plus and launch a hybrid B2C/B2B store in just two months.

F-Musiikki

Movie Theaters

Regal Cinemas

One of the largest cinema chains in the US, Regal Cinemas, partnered with Shero to migrate from Magento to Shopify, building a 100%Credit-based checkout logic replicated in a custom Shopify app, loyalty reward redemption, Vista Cloud integration, and automated corporate gifting workflows across two distinct eCommerce platforms. As a result, they achieved over 40% faster page load time.

Regal Cinemas

Built to load fast and stay fast

Every build goes live with the speed and code standards that keep the store fast after launch.

Core Web Vitals
Templates built and tested to pass on mobile.
Fewer apps
Features built into the theme when an app would slow the store.
Clean code
Online Store 2.0 sections your team can edit without a developer.
QA
Every release tested on desktop, mobile and checkout.

Moving your Scripts to Shopify Functions? Let's talk.

Book a Script Audit

01

Discovery and Script audit
In discovery we pull the Scripts customizations report and sort each Script into a native feature, a public app or a custom Function.
02

Development
Custom Functions are created with Shopify CLI in a custom app for your Plus store and tested locally first.
03

Result checks
We put sample carts through checkout and compare them with past orders placed under your old discount, shipping and payment Scripts.
04

Testing and UAT
Every promotion, customer segment and order type is tested at checkout with live payments, and you sign off in UAT.
05

Launch and upkeep
We launch the Functions, then update them as discounts and B2B tiers change and check them against each API release.

Frequently asked questions.

Can't find what you're looking for? Reach out to our team.

01

What happened to Shopify Scripts on June 30, 2026?

All Shopify Scripts ceased executing on June 30, 2026. There was no grace period, no automatic conversion, and no rollback option. Custom discount logic, shipping rules, and payment gating written in Ruby Scripts stopped working on that date. Stores that did not migrate before the deadline reverted to Shopify's default checkout behavior for anything that was handled by Scripts.

02

What is the difference between Shopify Scripts and Shopify Functions?

Scripts were Ruby code executing in a sandbox on Shopify's servers with variable execution time and limited composability. Functions are compiled WebAssembly modules that execute on Shopify's core infrastructure in under 5 milliseconds with no cold starts. Functions are created as apps through the Partner Dashboard, making them maintainable and deployable through Shopify CLI. The underlying logic must be rewritten and cannot simply be converted.

03

Do Shopify Functions require Shopify Plus?

04

What logic typically requires a custom Function instead of a public app?

B2B pricing matrices keyed to customer metafields, complex discount stacking across multiple conditions, payment method gating based on customer segment or company account, hazmat shipping restrictions on specific product types, and cart transform logic that splits bundle components into individual line items. These are use cases that no off-the-shelf app covers correctly because the logic is specific to the store's business model.

05

How long does a Script to Functions migration take?

Simple Scripts with straightforward logic take two to four weeks. Mid-complexity Scripts with tiered pricing, conditional stacking, or multi-variable rules take six to ten weeks. Complex Scripts combining B2B pricing matrices, payment gating, and shipping logic take ten to sixteen weeks. Timeline is scoped in the audit based on the number of Scripts, their complexity, and how well the original logic is documented.

06

Can Shero create Functions for a store that never used Scripts?

Scripts migration is one entry point; new custom functionality is another. Brands that have always wanted custom checkout logic but did not have access to Script Editor (or wanted a more maintainable architecture) can write Functions directly. Common first projects include B2B tiered pricing Functions, checkout validation for minimum order requirements, and shipping rate logic for multi-carrier B2B accounts.

What our clients say.

We design experiences that make a difference. See what our clients have to say about working with us.

Invisible Bead Extensions®

"Working with Shero Commerce on our migration from WordPress to Shopify was honestly such a pleasant experience. We’d been on WordPress for five years with tons of content and very specific styling, and moving all of it into one cohesive Shopify site was no small feat, this was a genuinely complex, highly technical migration. But they pulled it off on deadline with zero errors and zero issues. Their team showed up with everything we needed: a project manager, multiple developers, marketing leads, email specialists, and CRO experts, all coordinated through dedicated meetings and a real task management system. They also designed several high impact conversion pages so our digital presence didn’t just function better, it looked beautiful too. Since migrating, we’ve seen an increase in revenue thanks to having one simplified, cohesive platform. I’m so grateful for how seamlessly they executed this, and I’d recommend Shero Commerce to anyone facing a migration like ours."

Jasmine Hadjis

CEO, IBE / Invisible Bead Extensions®

Justrite Safety Group

"The collaboration between us and Shero Commerce on the Justrite multi-store site went beyond what we had hoped for. They are a terrific partner to work with. Their team’s dedication to understanding our unique requirements and delivering a high-quality, customized solution has greatly enhanced our online presence. The new website not only showcases our products effectively but also streamlines the shopping experience for our customers. We couldn’t be happier with the results and look forward to working with Shero Commerce on future projects."

Douglas J. Stang

VP of eCommerce / Justrite Safety Group

Benchmade Knife Co.

"Working with Shero Commerce for the past three years has been a game-changer for our B2B eCommerce business.Their expertise in email marketing, website support, and eCommerce strategy has significantly improved our online presence and optimized our B2B operations.The team’s dedication to our success is evident, and we’re excited to continue our partnership with them. If you’re looking for a reliable and results-driven eCommerce agency, look no further than Shero."

Joe Prebich

VP of Marketing / Benchmade Knife Co.

STX

"Since partnering with Shero Commerce, our eCommerce revenue has grown by 200%. Their 24/7 support and innovative solutions have been game-changers for our business."

James McKenna

Senior Commerce & CX Manager / STX

And you?

Let's build something great together.

Ready to scale your eCommerce business? Tell us about your project and we'll get back to you within 24 hours.

Email

[email protected]

Locations

New York • London • Helsinki • Tirana

Shopify Functions Development Services

What Shopify Functions are and can do