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

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
Step 1
Audit
We review your current Shopify setup, data flows and pain points.
Step 2
Spec
Detailed integration spec covering APIs, webhooks, error handling and edge cases.
Step 3
Build
Built and tested in a dev store with full logging and rollback safety.
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.
How a Custom Shopify-ERP Integration Eliminated Stock Discrepancies for a UK Retailer
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."
How We Eliminated 40 Hours of Weekly Admin for a UK E-Commerce Business
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."
How a Custom Integration API Replaced a Failing Zapier Stack for a UK B2B SaaS
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."
Automating E-Commerce Product Data Collection for UK Businesses
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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