Shopify Custom App Development Company
Purpose-Built Shopify Applications for Your Exact Business Logic and Operational Needs
Custom Private Apps, Shopify Functions, Admin UI Extensions, Checkout Customisation & Public App Development - Extend Shopify Beyond Its Out-of-the-Box Limits
Shopify is the most capable e-commerce platform in the world - but every serious merchant eventually reaches a point where their specific business requirements go beyond what Shopify's native features and available App Store apps can handle. A B2B merchant needing tiered volume pricing per customer segment. A DTC brand needing checkout fields that Shopify's native checkout does not support. A multi-location retailer needing order routing logic too complex for existing apps. A brand needing its Shopify store to talk to a custom ERP in exactly the right way. We build the custom Shopify apps that extend your store's capabilities to match your exact business model - using Shopify's official extension frameworks to ensure reliability, performance, and Shopify Plus compatibility.
Shopify Partner
Functions + Extensions + App Bridge
NDA Protected
Free Consultation
150+
Shopify Apps Delivered
50+
Shopify Functions Built
100%
Shopify API Compliance
10+
Years of Shopify Development
What Is Shopify Custom App Development and When Do You Need It?
Shopify custom app development is the process of building an application that runs within the Shopify ecosystem - extending the platform's native capabilities with business-specific functionality that no existing App Store app provides. Unlike theme customisation (which changes how your storefront looks) or using existing apps (which provide general-purpose features), custom app development builds exactly the functionality your specific business requires, integrated natively within Shopify's admin and storefront interfaces.
Shopify's extension architecture has matured significantly with the introduction of Shopify Functions (replacing Script Editor for business logic), Admin UI Extensions (replacing legacy embedded app iframes with native-feeling admin pages), Checkout UI Extensions (replacing the deprecated Checkout.liquid for checkout customisation), and App Bridge (the JavaScript library that integrates app UIs seamlessly into Shopify Admin). Together these extension points cover almost every customisation a merchant could need - the question is whether your specific requirement maps to one of these extension points and whether an existing App Store app already implements it.
At Evolution Infosystem, our Shopify custom app practice covers the full spectrum: custom private apps for individual merchants with specific operational requirements, Shopify Functions for complex business logic in discounts, shipping, payments, and order routing, Admin UI Extensions for custom admin workflows, Checkout UI Extensions for checkout customisation on Shopify Plus, App Bridge integrations for seamless admin embeds, and public app development for businesses building Shopify-compatible SaaS products. As a Shopify Partner, we build apps that meet Shopify's quality and security requirements.
When You Need a Custom Shopify App
- Pricing logic too complex for existing discount apps
- Checkout fields or flows Shopify native checkout does not support
- ERP/WMS integration requiring two-way real-time data sync
- B2B features: company-level pricing, credit terms, purchase orders
- Custom admin workflows for your operations team
- Order routing and fulfillment logic beyond Shopify's native rules
- Subscription or bundle logic not covered by existing apps
- Building a SaaS product that works within Shopify merchants' stores
When You Do NOT Need a Custom App
- An existing App Store app already handles your requirement
- Standard discount types: percentage, fixed, BOGO - use Shopify native
- Basic email automation - use Klaviyo or Shopify Email
- Simple product reviews - use Judge.me or Yotpo
- Standard upsell and cross-sell - use ReConvert or existing apps
- Basic loyalty points - use Smile.io or LoyaltyLion
- We audit your requirements first and recommend existing apps where they fit
Our Shopify Custom App Development Services
Evolution Infosystem covers the complete Shopify custom app development spectrum - from private apps and Shopify Functions through Admin UI Extensions, Checkout UI Extensions, App Bridge integrations, and full public app development for the Shopify App Store.
Shopify Private App Development
Custom apps built exclusively for a single Shopify store - accessing the store's Admin API (REST and GraphQL) for products, orders, customers, inventory, metafields, and all other store data. Private apps implement business-specific functionality: custom order processing workflows triggered by webhooks, automated product data management (bulk updates from supplier feeds), custom reporting pulling data the Shopify admin does not surface, integration with ERP or warehouse management systems, custom admin pages for operations teams, and automated customer communication workflows. Built using Node.js or Python with Shopify's official API libraries.
Shopify Functions Development
Extending Shopify's core business logic using the Functions framework - WebAssembly modules that run in Shopify's infrastructure to customise: (1) Discount calculation: tiered volume pricing by quantity, customer-tag-based pricing, buy-X-get-Y with complex conditions, combination discount rules. (2) Payment customisation: hide, rename, or reorder payment methods based on cart contents or customer attributes. (3) Delivery customisation: hide, rename, or sort shipping options based on cart or customer data. (4) Cart validation: prevent checkout when custom business rules are not met. Functions replace the deprecated Script Editor with a more powerful, language-agnostic (Rust, JavaScript, AssemblyScript) and better-performing framework.
Admin UI Extensions
Custom pages and components embedded natively in Shopify Admin using the Admin UI Extension framework - order detail extensions (adding custom data panels to the order page), customer detail extensions, product detail extensions, action extensions (custom workflows triggered from the admin), and bulk action extensions (applying operations to multiple selected orders or products). Admin extensions use Shopify's Polaris design system, making them look and feel like native Shopify admin features rather than third-party iframes. Built using React with the @shopify/ui-extensions-react library.
Checkout UI Extensions
Custom UI components added to the checkout flow for Shopify Plus merchants - custom fields collecting information not in Shopify's native checkout, custom upsell widgets showing targeted offers during checkout, delivery date pickers, gift message fields, custom validation messages, post-purchase extensions (additional offers shown after order completion), and checkout branding customisations. Checkout UI Extensions replace the deprecated Checkout.liquid for Shopify Plus stores and are the official supported path for checkout customisation. Built using React with @shopify/checkout-ui-extensions.
App Bridge Integration
Seamless integration of custom app UIs within Shopify Admin using App Bridge - the JavaScript library that connects embedded app iframes to the Shopify host application. App Bridge provides: navigation (updating the Shopify admin browser bar URL to match app state), contextual save bars (using Shopify's native save/discard bar rather than custom buttons), modal and toast notifications matching Shopify's UI, resource picker (selecting products, collections, or customers using Shopify's native pickers), and session token authentication (replacing the deprecated OAuth cookie-based approach for embedded apps).
Shopify ERP and WMS Integration Apps
Two-way integration between Shopify and external business systems - order sync from Shopify to ERP (new orders trigger ERP records), inventory sync from ERP/WMS to Shopify (stock level changes push to Shopify in real time), product catalogue sync from ERP to Shopify (product creation and price updates), customer account sync (new customer in Shopify creates customer in CRM), and fulfilment status push from WMS back to Shopify (shipping confirmation with tracking number updates order status). Robust integration with retry logic, error logging, and reconciliation dashboards. Integrated ERPs include: SAP, Oracle, Microsoft Dynamics, custom ERPs, Tally (via XML API), and WMS platforms.
Shopify Metafield and Metaobject Apps
Custom data management apps for extending Shopify's data model beyond its native fields - metafield definition management (creating and maintaining the metafield schema for products, variants, customers, and orders), bulk metafield editor interfaces (custom admin pages for efficiently editing metafields across large product catalogues), metaobject management (creating and managing custom structured data types - ingredient lists, sizing guides, sustainability data, technical specifications), and storefront metafield display using Shopify's Storefront API for headless implementations.
Public Shopify App Development
Building apps for listing in the Shopify App Store - apps that can be installed by any Shopify merchant. Public app architecture: OAuth authentication flow for multi-merchant token management, multi-tenant data isolation (each merchant's data stored separately), Shopify's managed billing API (subscription plans, usage billing, trial periods), app review compliance (meeting Shopify's quality, security, and UX review requirements), scalable infrastructure (handling installation spikes as the app gains users), and merchant-facing documentation and onboarding. Evolution Infosystem has published apps in the Shopify App Store and understands the review requirements in detail.
Does Your Shopify Store Have a Business Requirement That No Existing App Handles Correctly?
Tell us the requirement. We will audit the App Store for existing solutions first - and only recommend a custom app when nothing available handles your specific need.
Why Choose Evolution Infosystem for Shopify Custom App Development?
Shopify's extension framework evolves rapidly - what was best practice 18 months ago may now be deprecated. Building on deprecated APIs creates technical debt that eventually forces expensive rewrites. Here is how we keep your app on Shopify's supported path:
Official Extension Frameworks Only
We build exclusively on Shopify's official, supported extension frameworks - Shopify Functions, Admin UI Extensions, Checkout UI Extensions, and App Bridge. We do not use deprecated APIs (Script Editor, Checkout.liquid, legacy embedded app patterns) that will force a rewrite when Shopify deprecates them. Every app we build is designed to survive Shopify API version upgrades without major rework - we follow Shopify's versioned API lifecycle and maintain apps through API version transitions.
GraphQL Admin API - Not REST
Shopify's REST Admin API is in sunset - Shopify is transitioning all admin API access to GraphQL. We build all new custom apps using the GraphQL Admin API, ensuring your app is on the platform's long-term supported path. GraphQL Admin API provides better performance (fetch exactly the fields you need), better type safety, and better tooling (Shopify's GraphiQL explorer). We have deep expertise in Shopify's GraphQL schema - product, order, customer, inventory, and metafield queries and mutations.
Webhook Reliability and Idempotency
Shopify webhooks deliver events (order created, product updated, inventory changed) at-least-once - meaning the same event may arrive more than once. Apps that do not handle this correctly process the same order multiple times, creating duplicate ERP records, double-sending emails, or triggering duplicate inventory adjustments. We implement idempotent webhook handlers: every handler checks whether the event has already been processed before acting, using the webhook's event ID as the idempotency key.
Shopify Plus Architecture Expertise
Shopify Plus merchants have access to features - Checkout UI Extensions, checkout branding, B2B features, Flow automation, Launchpad, Multipass - that standard Shopify merchants do not. Custom apps for Shopify Plus stores require understanding which features are Plus-only and designing the app to work correctly across both Plus and standard plans if multi-merchant. We have built apps specifically for Shopify Plus brands and understand the Plus-specific API capabilities and limitations.
App Review-Ready Public App Quality
For public apps destined for the Shopify App Store, Shopify's review process examines security (no API key exposure, correct OAuth scope requests), UX quality (Polaris design system compliance, mobile responsiveness), performance (no blocking scripts, fast load time), and merchant data handling (GDPR compliance, data deletion webhooks). We build public apps to review-ready quality from the start - not building fast and hoping to fix issues during review.
Shopify-Specific Testing
Shopify apps require testing on real Shopify stores - development stores, Shopify Plus sandbox stores, and test payment gateways - not just unit tests in isolation. We test every app feature against real Shopify admin, real checkout flows, and real order processing. We test across Shopify themes (to ensure storefront extensions work correctly on different themes), across browsers, and on mobile (where Shopify admin is commonly used by merchants).
Our Shopify Custom App Technology Stack
| CATEGORY | PRIMARY | OPTION 2 | OPTION 3 | OPTION 4 | OPTION 5 |
|---|---|---|---|---|---|
| Shopify API | GraphQL Admin API | REST Admin API (legacy) | Storefront API (headless) | Partner API | - |
| App Framework | Shopify CLI 3.x | Remix (official template) | Next.js + custom | Express.js | - |
| Functions Language | JavaScript (WASM) | Rust (high-perf) | AssemblyScript | - | - |
| Admin UI Extensions | @shopify/ui-extensions-react | Polaris components | Admin Action ext | Admin Block ext | - |
| Checkout Extensions | @shopify/checkout-ui-extensions | Post-purchase extensions | Order status ext | - | - |
| App Bridge | @shopify/app-bridge-react | App Bridge vanilla JS | Session tokens (JWT) | - | - |
| Backend Language | Node.js (TypeScript) | Python (FastAPI) | Ruby on Rails | - | - |
| Auth Strategy | Session tokens (embedded) | OAuth 2.0 (public app) | Custom app token | - | - |
| Database | PostgreSQL | MySQL | SQLite (simple apps) | - | - |
| Webhook Processing | BullMQ (Redis queue) | SQS (AWS) | Inngest | Direct handler | - |
| Deployment | Fly.io | Railway | AWS ECS | Heroku | DigitalOcean Apps |
| Testing | Shopify CLI dev store | Jest unit tests | Playwright E2E | Webhook replay | - |
| Monitoring | Sentry | Datadog | Shopify Admin logs | Custom dashboard | - |
Category
- PRIMARYGraphQL Admin API
- OPTION 2REST Admin API (legacy)
- OPTION 3Storefront API (headless)
- OPTION 4Partner API
Our Shopify Custom App Development Process - 6 Phases
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Shopify Custom App Use Cases - Requirements We Have Built
B2B and Wholesale
Company-level pricing, credit terms, purchase orders
Custom B2B app for a Shopify Plus wholesale store: company-level price lists (different prices for different company accounts, not just customer tags), credit limit checking before checkout (Function blocks order if company outstanding exceeds limit), purchase order number field at checkout (Checkout UI Extension), PDF purchase order generation from the order, and admin extension showing company account details and credit status on the order detail page. Integrates with ERP for company account master data and outstanding balances.
ERP Integration
Real-time order sync, inventory sync, fulfilment
Bidirectional Shopify-ERP integration app: order webhook handler (orders/create, orders/updated) pushing new and updated orders to ERP via REST API with idempotent processing; inventory sync job running every 5 minutes pulling stock levels from ERP and updating Shopify inventory via GraphQL inventorySetOnHandQuantities mutation; fulfillment webhook receiving tracking numbers from ERP and creating Shopify fulfillments; and admin dashboard showing sync status, errors, and retry queue. Integrated ERPs: SAP, custom ERP via REST API, Tally via XML API.
Complex Pricing and Discounts
Tiered pricing, bundle discounts, customer-segment pricing
Pricing Functions replacing Script Editor: volume-based tiered discounts (5% off 10+, 10% off 25+, 15% off 50+), customer-segment pricing (different percentage off for Gold vs Silver vs Bronze customer tags), bundle discounts (buy products from 3 specific collections and get 20% off), and promotion stacking rules (maximum 2 discount combinations, discount code overrides automatic discounts). All tier configurations stored as metafields, editable from Shopify Admin without code deployment.
Custom Checkout Fields
Gift messages, delivery dates, custom validations
Checkout UI Extensions for Shopify Plus stores: gift message field with character limit (stored as order attribute, visible in admin and printed on packing slip), delivery date picker (showing available dates from external availability calendar API, blocking out holidays and lead-time-based unavailable dates), custom validation message (showing real-time stock warning if requested quantity is near inventory limit), and post-purchase upsell widget (showing complementary products using Shopify's recommendation API, one-click add to a new order).
Custom Admin Workflows
Bulk operations, approval workflows, custom data panels
Admin UI Extensions solving operational pain: custom product data panel displaying quality certificates, compliance data, and supplier information stored as metafields (with inline editing - no separate admin page); bulk order processing extension allowing operations team to update 50 orders simultaneously with custom status field; customer credit management extension showing outstanding balance, credit limit, and overdue invoices on the customer detail page from ERP API; and order approval workflow extension for B2B orders above threshold requiring management sign-off.
Public App Store Apps
Multi-merchant SaaS, App Store listing, billing API
Public apps we have built and listed on the Shopify App Store: a B2B price list management app (merchant creates customer-group price lists, customers see their prices on the storefront), a product compliance document app (attach certificates and compliance docs to products, display at checkout), and a purchase order management app (B2B buyers submit POs, merchants approve and convert to Shopify orders). All use Shopify's managed billing API for subscription plans and the Polaris design system for native admin UX.
Script Editor scripts stopped working?
We migrate Script Editor discount and shipping scripts to Shopify Functions - same business logic, new supported framework. Emergency timeline available for live stores.
Want to see our Shopify apps?
Browse 150+ Shopify custom apps - B2B wholesale, ERP integrations, pricing Functions, App Store apps - all live on Shopify stores today.
Shopify Custom Apps We Have Built - Featured Projects
- Merchants: 1 Plus store
- Accounts: 340 wholesale
- Stack: Shopify Functions, Checkout UI Ext, Admin Ext, Node.js
B2B Wholesale App - Fashion Brand, Shopify Plus
Complete B2B wholesale functionality for a Shopify Plus fashion brand with 340 wholesale accounts. Shopify Functions: company-level price list Function (each account has its own price multipliers per category), minimum order quantity Function (blocks checkout if order is below MOQ per product category), and payment customisation Function (shows 'Net 30' payment option only to approved credit accounts). Checkout UI Extension: PO number field, delivery date selection, and special instructions field. Admin UI Extension: wholesale account credit panel on customer detail page showing credit limit, outstanding, and overdue status from ERP API. Result: Wholesale ordering moved entirely to Shopify (previously email-based) - 340 accounts self-service ordering.
View Full Case Study- Orders/day: 800+
- Sync latency: <2 min
- Stack: Node.js, BullMQ, PostgreSQL, Shopify GraphQL API
ERP Integration App - Consumer Electronics D2C
Real-time bidirectional Shopify-ERP integration for a consumer electronics D2C brand processing 800+ orders per day. Architecture: Shopify orders/create webhook → BullMQ queue (handles 800 concurrent events without rate limit issues) → ERP order creation via REST API (idempotent - checks ERP for existing order before creating). ERP inventory sync: scheduler every 5 minutes pulls changed stock levels from ERP (delta sync, not full catalogue) → GraphQL inventorySetOnHandQuantities mutation. Fulfilment sync: ERP triggers webhook to app on dispatch → app creates Shopify fulfilment with tracking number → customer notified automatically. Admin dashboard showing sync queue status, errors, and retry controls. Result: Manual order entry into ERP eliminated (was 2 hours/day). Inventory sync latency from 24 hours to 5 minutes - no more overselling.
View Full Case Study- Scripts migrated: 6
- Stack: Shopify Functions (JS)
- Timeline: 3 weeks
Script Editor Migration - FMCG Brand
Emergency Script Editor migration for an FMCG brand whose 6 Scripts stopped working on Script Editor deprecation day - leaving their pricing and shipping customisations broken on a live store processing Rs. 12 lakhs/day. Scripts migrated: (1) Tiered quantity discount Function replacing Scripts for volume pricing, (2) Customer-tag-based loyalty pricing Function, (3) BOGO discount Function for promotional mechanics, (4) Free gift Function adding product to cart when threshold met, (5) Shipping rate renaming and hiding Function, (6) COD restriction Function blocking cash on delivery for digital products. All 6 Functions tested and deployed within 3 weeks, restoring full pricing and shipping functionality. Result: Store pricing and shipping customisations fully restored. Zero pricing errors since migration.
View Full Case Study- App Store: Listed
- Installs: 800+
- Stack: Remix, PostgreSQL, Shopify Billing API, Polaris
Public App - Product Compliance Manager
Product compliance document management app published on the Shopify App Store - allows merchants to attach compliance certificates, safety data sheets, test reports, and quality documents to products and display them at checkout. Architecture: Remix framework (Shopify's recommended stack), multi-tenant PostgreSQL (each merchant's documents isolated), Shopify Billing API for subscription plans (Free up to 100 products, Pro unlimited), Admin UI Extension for document attachment on product detail page, Checkout UI Extension displaying relevant documents at checkout, and GDPR-compliant data deletion on app uninstall. App review passed on first submission. Result: 800+ active installs, 4.8 star rating.
View Full Case StudyShopify Extension Framework Decision Guide - Which API for Your Requirement?
| REQUIREMENT |  |  |  |
|---|---|---|---|
| Custom discount logic (tiered, B2B, complex) | Shopify Functions | discount-code or automatic discount Function | Replaces Script Editor. WebAssembly. Runs in Shopify infra. |
| Hide/reorder payment methods at checkout | Shopify Functions | payment-customization Function | Plus only. E.g., hide COD for digital goods. |
| Hide/reorder shipping methods | Shopify Functions | delivery-customization Function | Rename rates, hide by cart value or destination. |
| Block checkout with custom validation | Shopify Functions | cart-transform or order-routing Function | E.g., min order qty, max cart value. |
| Custom field in checkout (gift note, date picker) | Checkout UI Extension | checkout.block.render target | Plus only for checkout page. All plans for post-purchase. |
| Upsell widget in checkout | Checkout UI Extension | checkout.block.render target | Plus only. Placed in checkout flow. |
| Post-purchase offer page | Checkout UI Extension | purchase.thank-you.block.render | Available all plans. |
| Custom panel on Order detail page | Admin UI Extension | admin.order-details.block.render | Shows in Shopify Admin order page. |
| Custom panel on Product detail page | Admin UI Extension | admin.product-details.block.render | Custom metadata UI for products. |
| Custom admin page (full page) | Embedded App + App Bridge | @shopify/app-bridge-react | Full custom React page embedded in Admin. |
| Automate on order created/updated | Webhook handler | orders/create, orders/updated | Backend processing, not UI extension. |
| Sync inventory from ERP to Shopify | Scheduled job + Admin API | inventorySetOnHandQuantities mutation | GraphQL mutation, not extension. |
| Multi-merchant app (App Store) | Public App | OAuth + App Store listing | Requires Shopify review and approval. |
KEY REMINDERS FOR 2026: (1) Script Editor is fully deprecated - all new discount logic must use Shopify Functions. (2) Checkout.liquid is deprecated for Shopify Plus - all checkout customisation must use Checkout UI Extensions. (3) REST Admin API is in sunset for new apps - use GraphQL Admin API for all new development. (4) Legacy embedded app patterns (cookies, HMAC sessions) are replaced by session tokens - all new embedded apps must use App Bridge with session token authentication. (5) Private apps are now called 'custom apps' in Shopify's admin. Building on these deprecated APIs means your app will require a costly rewrite when Shopify removes them.
Frequently Asked Questions - Shopify Custom App Development
A Shopify custom app is an application built specifically for a single Shopify store to extend its functionality with business-specific features not available in the platform or App Store. Custom apps access the store's Admin API (REST or GraphQL) to read and write store data - products, orders, customers, inventory, and metafields. They can add new admin pages, automate workflows triggered by Shopify webhooks, implement complex business logic using Shopify Functions, and integrate the store with external systems. Custom apps are installed on one store using a store-specific API key and are not listed in the Shopify App Store. Shopify previously called these 'private apps' - the term changed in Shopify's admin but the functionality is the same.
Shopify Functions are server-side extension modules that customise Shopify's core business logic - discount calculation, payment method display, shipping rate display, cart validation, and order routing. Functions are compiled to WebAssembly and run inside Shopify's own infrastructure (not on the developer's server), ensuring they execute with Shopify's performance guarantees. A Function receives input data (cart contents, customer information, configuration) as JSON, applies business logic, and returns an output (discount to apply, payment methods to show, shipping rates to display) in a format Shopify understands. Functions are the official replacement for the Script Editor, which was deprecated in 2024. They support JavaScript, Rust, and AssemblyScript.
Script Editor (now deprecated) allowed merchants to write Ruby scripts that customised discount and shipping logic, running on Shopify's servers. Shopify Functions replaced Script Editor with a more powerful, more performant, and more flexible framework. Key differences: Functions support more extension points (discounts, payments, shipping, cart validation, order routing, fulfilment - vs Script Editor's limited scope), Functions are language-flexible (JavaScript, Rust, AssemblyScript vs Ruby only), Functions run as WebAssembly for better performance, and Functions are tested locally using the Shopify CLI before deployment. All Script Editor scripts stopped working in August 2024 - any merchant still using Script Editor-based discount or shipping logic needs to migrate to Functions immediately.
A Checkout UI Extension is the official way to add custom UI components to the Shopify checkout flow for Shopify Plus merchants. Extensions can add: custom fields for collecting information not in Shopify's native checkout (gift messages, delivery date pickers, custom delivery instructions), promotional widgets showing targeted offers during checkout, custom validation messages, and post-purchase components shown on the thank-you page (available to all plans). Checkout UI Extensions replaced Checkout.liquid for Shopify Plus stores - Shopify deprecated checkout.liquid in 2024 and now requires all checkout customisation to use the Extension framework. Extensions are built with React using @shopify/checkout-ui-extensions-react and must comply with Shopify's performance requirements.
App Bridge is a JavaScript library that connects an embedded Shopify app's UI to the Shopify Admin host application. When a merchant installs a Shopify app and opens it in Shopify Admin, the app runs inside an iframe. App Bridge provides the APIs that make the app feel native to the Shopify admin: session token authentication (replacing the deprecated cookie-based approach, generating secure JWT tokens for API calls), navigation (updating the Shopify admin's browser URL when the app navigates internally), contextual save bars (using Shopify's native 'Save / Discard' bar at the top of the page), modal dialogs that match Shopify's UX, resource pickers (the native Shopify product/customer picker component), and toast notifications. Apps not using App Bridge correctly either fail security requirements or feel jarring compared to native Shopify admin UX.
Shopify webhooks are HTTP POST requests sent by Shopify to your app's endpoint when specific events occur in the store - orders/create, orders/updated, products/update, inventory_levels/update, customers/create, and dozens more. Your app subscribes to relevant webhooks and processes them in a webhook handler. Shopify delivers webhooks at-least-once, meaning the same event may arrive multiple times (network retries, Shopify's delivery guarantee policy). This makes idempotency critical: if your webhook handler creates an ERP order on orders/create, and the same webhook is delivered twice, you must not create two ERP orders. Idempotent handlers check whether the event has already been processed (using the X-Shopify-Webhook-Id header as a unique key) and skip processing if it has - resulting in no duplicate action.
Yes - Shopify Functions are the official replacement for Script Editor, which was deprecated in August 2024. If you had Script Editor scripts for discount logic (tiered pricing, BOGO, customer-specific discounts) or shipping customisation, those scripts stopped working when Script Editor was removed. Shopify Functions provide all the same capabilities and more, with better performance and more extension points. The migration process involves: identifying what each Script Editor script was doing, rewriting the logic as a Shopify Function in JavaScript or Rust, testing the Function using the Shopify CLI local testing framework, deploying to your store, and removing the legacy script. Evolution Infosystem has migrated multiple merchants from Script Editor to Functions - the migration typically takes 1-3 weeks depending on the complexity of the original scripts.
Publishing in the Shopify App Store requires: (1) Shopify Partner account in good standing. (2) App review submission through the Partner Dashboard - Shopify reviews for security (no API key exposure, correct OAuth implementation, HTTPS), UX quality (Polaris design system usage, mobile responsiveness, loading performance), merchant data handling (GDPR compliance, mandatory customer data deletion webhook), and functionality (app does what it claims, no broken features). (3) App Store listing with screenshots, feature descriptions, and pricing. (4) Privacy policy URL. (5) Data handling declaration (what data the app accesses and why). Review typically takes 2-4 weeks. Common rejection reasons: excessive API scope requests, missing GDPR webhook handlers, App Bridge not used in embedded sections, and performance issues (slow load time on first install).
Shopify private app development, Shopify Functions development, Admin UI Extensions, Checkout UI Extensions, App Bridge integration, Shopify ERP and WMS integration apps, Shopify metafield and metaobject apps, and public Shopify App Store app development.
Yes. Evolution Infosystem is a Shopify Partner - building custom apps, themes, and integrations for Shopify merchants and developing apps for the Shopify App Store.
Yes. Evolution Infosystem provides Script Editor to Shopify Functions migration - rewriting existing Ruby-based Script Editor discount and shipping scripts as WebAssembly Shopify Functions in JavaScript or Rust.
GraphQL Admin API for all new app development - the REST Admin API is in Shopify's sunset process. Storefront API for headless commerce and custom storefront implementations.
Yes. Evolution Infosystem has published apps on the Shopify App Store, including a product compliance document management app with 800+ active installs and a 4.8-star rating.
Ready to Extend Shopify to Match Your Business - Not the Other Way Around?
150+ Shopify apps. Functions. Admin Extensions. Checkout UI. ERP Integrations. App Store apps. All on Shopify's official supported extension frameworks.