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Shopify Functions

Shopify Functions & Extensions Development

We build Shopify Functions using the modern extension-only architecture that runs custom logic at the edge in under 5 milliseconds. Compiled to WebAssembly for maximum performance, our functions handle discount calculations, payment customizations, delivery rules, cart transformations, and fulfillment constraints at a scale that was impossible with legacy Script Editor.

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INR 2000/hr

~$24/hr

200+

Apps Delivered

4.9/5

Client Rating

<2 Weeks

MVP Delivery

Trusted by businesses worldwide

ShopifyAmazonStripeSlackNotionVercel

Custom Logic at the Speed of Commerce

Shopify Functions let you extend core Shopify behavior with custom logic that runs in a sandboxed WebAssembly environment at the edge

Discount Functions

Custom discount logic beyond what Shopify's built-in discount system supports. Tiered quantity discounts, bundle pricing, BOGO with complex conditions, customer-segment-specific offers, and time-based promotional rules that execute at checkout in milliseconds.

Payment Customization

Control which payment methods are shown, hidden, or reordered at checkout based on cart contents, customer tags, shipping address, or order value. Hide COD for high-value orders, show B2B payment terms for wholesale customers, or enforce payment methods by region.

Delivery Customization

Rename, reorder, hide, or add custom messaging to shipping options at checkout. Show estimated delivery dates, hide express shipping for bulky items, enforce local pickup for certain products, or display carrier-specific messaging based on destination.

Cart Transform

Modify cart line items programmatically before checkout. Auto-add free gifts based on cart value, create product bundles that merge into single line items, apply automatic cart-level adjustments, and implement custom cart rules that reshape the shopping experience.

Order Routing

Custom fulfillment order routing logic that determines which location fulfills each line item. Route orders based on inventory proximity, warehouse capacity, product type, or custom business rules. Optimize shipping costs by splitting orders intelligently across locations.

Fulfillment Constraints

Define custom constraints on how orders can be fulfilled. Enforce pickup-only for hazardous materials, restrict certain products to specific fulfillment locations, prevent splitting of bundle items across shipments, or enforce cold chain requirements for perishables.

Shopify Functions Performance

<5ms

Execution Time

Wasm

Powered

Edge

Runtime

Zero

Downtime

How We Build Shopify Functions

A specialized process for developing, testing, and deploying Wasm-compiled functions to Shopify's edge runtime

Logic Mapping & Function Selection
We analyze your business rules and map them to the correct Shopify Function API targets: product discounts, order discounts, shipping discounts, payment customization, delivery customization, cart transform, order routing, or fulfillment constraints. Each function type has specific inputs and outputs we architect for.
Function Development in Rust or JavaScript
We write the function logic in Rust (for maximum performance) or JavaScript (for easier maintenance), following Shopify's Function API schemas. The code is compiled to WebAssembly with strict memory and execution time limits. We use Shopify CLI for local development with hot reloading.
Input Query & Metafield Configuration
We define the GraphQL input queries that fetch exactly the data your function needs at runtime: cart lines, customer data, shipping addresses, product metafields, and variant properties. We configure metafields for merchant-facing settings so store owners can adjust function behavior without code changes.
Testing with Real Checkout Scenarios
We test functions against real checkout scenarios using Shopify's function runner, development stores, and simulated cart states. Every edge case is covered: empty carts, mixed product types, international addresses, multiple discount combinations, and high-quantity orders.
Deployment & Merchant Configuration
We deploy the function via Shopify CLI and configure the merchant-facing UI where store owners can manage function settings. Post-deployment monitoring tracks execution times, error rates, and function invocation counts. We verify zero impact on checkout performance.

Shopify Functions Development Pricing

Custom backend logic running at the edge for your Shopify store. All prices in INR with USD equivalents.

Starter
INR 50,000~$600 USD
Single Shopify Function for one customization need
  • Single function (discount, payment, or delivery)
  • Rust or JavaScript implementation
  • Wasm compilation & optimization
  • Metafield-based configuration UI
  • Development store testing
  • Source code handover
  • Deployment documentation
  • 14-day post-launch support
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Most Popular
Professional
INR 1,50,000~$1,800 USD
Multiple functions for comprehensive checkout and fulfillment customization
  • Up to 5 Shopify Functions
  • Discount + payment + delivery customization
  • Cart transform functions
  • Merchant configuration dashboard
  • Script Editor migration included
  • Complex conditional logic
  • Performance benchmarking
  • Edge case test coverage
  • 30-day post-launch support
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Enterprise
Custompricing
Complete function suite with order routing, fulfillment constraints, and advanced logic
  • Unlimited Shopify Functions
  • Order routing & fulfillment constraints
  • Full Script Editor migration
  • Custom Rust development for max performance
  • Multi-function orchestration
  • A/B testing framework for functions
  • Real-time monitoring dashboard
  • Dedicated project manager
  • SLA-backed ongoing support
Contact Sales

What Our Shopify Functions Clients Say

"Our legacy Script Editor discounts were hitting performance limits during flash sales with 10,000+ concurrent checkouts. Edesy rewrote them as Shopify Functions in Rust compiled to Wasm, and execution dropped from 200ms to under 3ms. Our checkout completion rate improved by 4% during our next sale event purely from the speed improvement."

DO

Director of Engineering

Engineering at High-Volume DTC Brand

"We needed payment method customization that hid COD for orders over $200, showed B2B net terms only for approved companies, and reordered payment methods by customer region. No app on the store could handle all three conditions together. Edesy built a single payment customization function that handles all of it in under 2ms per checkout."

EM

E-Commerce Manager

E-Commerce at Global Lifestyle Brand

"Edesy built a cart transform function that automatically bundles complementary products, adds free gifts at specific cart thresholds, and adjusts line item properties for our fulfillment system. The auto-bundling alone increased our average order value by 18%. The function runs on every cart update with zero perceptible latency."

GL

Growth Lead

Growth at Beauty & Skincare Brand

Shopify Functions & Extensions FAQs

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Resources to help you evaluate and implement

Public App DevelopmentPrivate App DevelopmentEmbedded App DevelopmentShopify Plus Apps

Ready to Build Custom Logic with Shopify Functions?

Get a free consultation and detailed project estimate. We build Wasm-powered Shopify Functions that execute in under 5ms and give you complete control over discounts, payments, shipping, and fulfillment.

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  • AI Voice Assistant
  • WhatsApp Voice AI
  • WhatsApp Bot Builder
  • AI Website Chatbot
  • AI-SDR
  • Number Masking
  • Shopify Apps
  • View All Products
  • For E-commerce
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  • View All Use Cases
  • AI Chatbot Development
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  • Shopify Development
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  • WhatsApp API Integration
  • View All Services
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  • Voice Agent Docs
  • API Reference
  • Number Masking API Docs
  • Blog
  • Changelog
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  • Privacy Policy
  • Terms of Service

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