Shopify API Integration

Connect Shopify to any system using Admin, GraphQL and Storefront APIs.

Shopify API Integration — overview visual

What it is

From inventory sync to bespoke checkout flows, we build robust Shopify integrations using the Admin API, GraphQL API, Storefront API and Checkout Kit.

  • Real-time inventory and order sync with ERPs and warehouses
  • Headless storefronts with Storefront API + Next.js
  • Custom checkout extensions and personalisation
  • Marketplace bridges to Amazon, eBay and social commerce

How it works

  1. Step 1

    Audit

    We review your current Shopify setup, data flows and pain points.

  2. Step 2

    Spec

    Detailed integration spec covering APIs, webhooks, error handling and edge cases.

  3. Step 3

    Build

    Built and tested in a dev store with full logging and rollback safety.

  4. Step 4

    Launch

    Phased rollout, monitoring dashboards and post-launch support.

Use cases

Real-time inventory sync

Shopify and a warehouse management system stay in lock-step — no more overselling.

Personalised checkout

Checkout extensions tailor the buying journey using customer data, lifting conversion.

Multi-channel selling

One unified API layer connects Shopify to Amazon, eBay and social commerce.

Local terms & topics

A short reference of the shopify api integration terms we get asked about most often by Bournemouth, Poole and wider Dorset clients.

Shopify integration Bournemouth
Connecting Shopify to ERP, accounting, 3PL and POS systems for Dorset-based ecommerce brands.
Shopify Admin API
The authenticated API used to sync orders, customers, products and inventory between Shopify and back-office tools.
Storefront API headless
GraphQL endpoint used to power custom storefronts, mobile apps and PWAs over a Shopify backend.
Shopify webhook handler
Server endpoints that react to order, fulfilment and inventory events in real time.
Multi-channel inventory sync
Keeping stock levels accurate across Shopify, eBay, Amazon and an EPOS or warehouse system.
Shopify Plus partner UK
Agency-level support for higher-volume merchants needing scripts, Flow, B2B and Functions work.

Proof it works

Real Shopify API Integration results

Anonymised UK case studies showing measurable outcomes from the exact service you're reading about.

All case studies
Shopify IntegrationFeatured

How a Custom Shopify-ERP Integration Eliminated Stock Discrepancies for a UK Retailer

0
Oversells per month (was 12)
99.8%
Inventory accuracy
40 min
Order processing (was 4 hrs)

A real-time bidirectional sync between Shopify and a legacy warehouse ERP — eliminating 12 monthly oversells, lifting inventory accuracy to 99.8% and cutting order processing from 4 hours to 40 minutes.

"We went into Black Friday genuinely calm for the first time in years. Stock was right, orders flowed, no awkward refund emails. The system just works."

— E-commerce Manager, UK Homeware Retailer (anonymised)
AI Automation

How We Eliminated 40 Hours of Weekly Admin for a UK E-Commerce Business

92.5%
Admin time reduction
£26,000
Annual saving
6 weeks
Payback period

A custom AI workflow automation system that cut a £2.5M UK retailer's manual admin from 40 hours to 3 hours per week — saving roughly £26,000 per year and eliminating data entry errors entirely.

"We've effectively recovered a full-time salary and our accounts finally tie up at the end of every month. The shipping emails alone made our customer reviews jump."

— Operations Director, UK E-commerce Retailer (anonymised)
API Development

How a Custom Integration API Replaced a Failing Zapier Stack for a UK B2B SaaS

100%
Event delivery (was 94%)
£18,400
Annual saving
5 weeks
Build time

A bespoke event-driven API layer connecting a UK B2B SaaS to HubSpot, Xero and Slack — lifting event delivery from 94% to 100%, saving £18,400 a year in Zapier fees and reconciliation, and paying back in the second month.

"Our Zapier bill is gone, finance has stopped chasing missing invoices, and sales actually trusts the Slack alerts again. It feels boring, in the best possible way."

— CTO, UK B2B SaaS (anonymised)
AI Automation

Automating E-Commerce Product Data Collection for UK Businesses

10–30 hrs
Saved per week
15+
Platforms supported
Minutes
From URL to import-ready CSV

A bespoke web application built by Streamline Digital that scrapes, enriches, and exports product data from 15+ e-commerce platforms — saving businesses up to 30 hours of manual work every week.

Frequently asked questions

What is Shopify API integration?

Shopify API integration connects your Shopify store to external systems and tools using Shopify's official APIs. This allows your store to automatically share data with warehouses, ERPs, CRMs, shipping platforms, marketplaces, and any other software your business uses.

Which Shopify APIs do you work with?

We work with the full suite of Shopify APIs including the Admin REST API, Admin GraphQL API, Storefront API, Checkout Extensibility Kit, Webhooks API, and the Shopify Partner API. The right API depends on what you're building and where in the customer journey it operates.

Can you connect my Shopify store to my ERP or warehouse system?

Yes. This is one of the most common integrations we build. We create a custom API layer between Shopify and your ERP or warehouse management system so that orders, inventory levels, customer data, and fulfilment updates sync in real time between both platforms.

How long does a Shopify integration take to build?

A straightforward single-system integration typically takes two to four weeks. More complex multi-system integrations with custom business logic can take six to twelve weeks. We always begin with a discovery phase to map your requirements before quoting a timeline.

Will the integration break if Shopify updates its API?

We build all integrations to Shopify's current stable API versions and monitor Shopify's developer changelog for breaking changes. We also provide ongoing maintenance options so your integration stays updated and working as Shopify evolves.

Can you build a custom Shopify app for my store?

Yes. We build custom public and private Shopify apps from scratch. Private apps are built exclusively for your store and can automate internal processes, add custom functionality, or connect to proprietary systems. Public apps can be listed in the Shopify App Store.

What is the difference between Shopify Admin REST API and Admin GraphQL API?

The Admin REST API is the original interface and is well documented for simple CRUD operations. The Admin GraphQL API is newer, faster for complex queries, and lets you request exactly the fields you need in a single request. Shopify is steering all new development toward GraphQL, especially for high-volume operations like inventory sync.

How much does a custom Shopify integration cost in the UK?

A simple single-system integration typically costs between £3,500 and £7,500. A real-time bidirectional Shopify-to-ERP or warehouse integration usually falls in the £8,000–£15,000 range. Multi-channel sync covering Shopify, Amazon and eBay typically costs £10,000–£20,000. Every quote is fixed-fee.

Can you integrate Shopify with my UK accounting software like Xero or QuickBooks?

Yes. We build custom Shopify-to-Xero and Shopify-to-QuickBooks integrations that handle orders, refunds, payment reconciliation, multi-currency, partial fulfilments and complex VAT scenarios — handling edge cases that off-the-shelf apps like A2X or Synder often struggle with.

Does my store need to be on Shopify Plus for a custom integration?

No. Custom Admin API and webhook integrations work across all Shopify plans. Shopify Plus unlocks additional capabilities — Shopify Functions, multi-store management, B2B and Checkout Extensibility — but the standard plans support the vast majority of integration use cases.

Shopify API Integration

Get a tailored quote for your project

Tell us a little about what you need and we'll come back within one working day with a fixed-fee proposal — no obligation, no sales pressure.

  • Fixed-fee pricing agreed in writing before any work begins
  • Reply within one UK working day
  • Dorset-based, working with UK businesses

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