Custom Shopify API integration development
Appfront builds custom Shopify integrations that seamlessly connect your webshop with ERP systems, fulfilment, accounting, PIM and your own applications. Using the Admin API, Storefront API and webhooks, we automate the data flows that keep your e-commerce operation running smoothly, from product management and stock updates to order processing and customer data.
What is a Shopify API integration?
Shopify is the e-commerce platform behind millions of online shops worldwide. What makes Shopify particularly strong for integrations is its rich set of APIs: the Admin API (available as REST and GraphQL) for full store management, the Storefront API for headless applications, and an extensive Webhook system that fires real-time events whenever something changes in your store.
A Shopify API integration connects that e-commerce engine with the rest of your business systems. Orders flow automatically into your accounting, product data is managed centrally from your PIM, stock levels are synchronised in real time with your warehouse, and customer profiles remain consistent across all channels.
Appfront builds these integrations to measure using the official Shopify Developer APIs. For each use case we choose the right API and synchronisation pattern: event-driven via Webhooks, periodic bulk sync via GraphQL, or real-time via the Storefront API, tailored to your scale and operational requirements.
Product & stock sync
Products, variants, prices and stock levels are automatically synchronised between Shopify and your PIM, ERP or warehouse system. No manual imports, and no products sold that are out of stock.
Order management
New orders automatically trigger fulfilment workflows, invoice creation in your accounting system and shipping updates to the customer. The entire order chain runs without manual intervention.
Headless commerce
With the Storefront API and Hydrogen, you can build fully custom front ends with complete control over design and performance, while Shopify handles checkout, payments and order management.
Our development process for Shopify integrations
From mapping out your data flows to a working integration that grows with your revenue. Every step is aimed at an integration that runs reliably under peak load and is easy for your own team to monitor.
We map out all data flows: which Shopify resources (products, orders, customers, inventory) connect to which systems, in which direction, and how often.
For each data flow, we choose the right Shopify API (Admin REST, GraphQL, Storefront) and the matching pattern: webhooks for real-time events, bulk operations for large datasets.
Implementation with automated tests against Shopify's development store. Rate limiting, retry logic and idempotent processing are built in from day one.
Phased rollout with data validation on the production environment, followed by ongoing monitoring of sync status, error rates and API quota usage.
What a Shopify API integration delivers in practice
Every integration is tailored to your specific e-commerce workflow. These are the capabilities we most often build for organisations that want to connect their Shopify environment with the rest of their software landscape.
Product synchronisation
Products, variants, images, metafields and collections are managed centrally in your PIM or ERP and automatically pushed to Shopify. Price changes, new SKUs and seasonal collections appear in your shop straight away, without manual entry.
Orders & fulfilment
Incoming Shopify orders are passed on directly to your fulfilment partner, WMS or ERP via webhooks. Track & trace codes flow back to Shopify so customers receive shipping updates automatically. Returns handling is included.
Inventory automation
Stock levels are synchronised bidirectionally across all your sales channels and warehouses. The Inventory Levels API pushes changes through with every sale, return or stock receipt, so overselling becomes a thing of the past.
Customer data sync
Customer profiles, order history, tags and metafields are synchronised with your CRM or marketing platform. Segmentation in tools such as Klaviyo, HubSpot or ActiveCampaign stays up to date without manual list imports.
Multi-channel integration
Shopify as a hub for multiple sales channels: bol.com, Amazon, physical stores via Shopify POS and your own B2B portals. Product data, inventory and orders are managed centrally and tailored to the specific requirements of each channel.
Custom checkout
With Checkout Extensions and Shopify Functions, we build custom checkout adjustments: dynamic shipping rules, local tax calculation, B2B discount logic or loyalty points integration. All within Shopify's extensibility framework.
Typical use cases in practice
Depending on your business model, a Shopify integration can look very different. We regularly see a number of recurring patterns, and for each we have developed a proven approach.
Webshops with ERP integration
D2C brands and retailers processing hundreds of orders a day connect Shopify with their ERP (Exact Online, SAP, Unit4) so that orders automatically become invoices, stock is held centrally and financial reports are accurate immediately. No overnight CSV imports, just a continuous flow. See also our e-commerce development.
B2B wholesale portals
Wholesalers and manufacturers using Shopify Plus often need custom price lists per customer segment, minimum order quantities and net payment terms. We connect this B2B logic to your existing customer database and invoicing system so that business customers can place orders independently on their own terms.
Multi-channel retailers
Retailers that sell through bol.com, Amazon or physical stores using Shopify POS alongside their Shopify webshop. We build a central integration layer that keeps stock synchronised across all channels, routes orders from every source to the same fulfilment system and enables reporting per channel.
SaaS providers with Shopify integration
Software providers who want to integrate their product with their customers' Shopify stores. We build Shopify apps or private integrations that connect securely via OAuth to end users' stores, exchange data and respond in real time to shop events through webhooks.
Technology we use
We build Shopify integrations with modern stacks suited to the scale and speed of e-commerce. The choice depends on your existing infrastructure and growth plans, and we ensure that your team or a future supplier can maintain and further develop the integration.
Why choose Appfront for your Shopify integration?
Appfront builds API integrations for e-commerce businesses that take Shopify seriously as a sales channel. We begin with a thorough analysis of your data flows and systems landscape. An integration must not only work technically, but also scale as your order volume grows.
With every integration, we deliver clear documentation and monitoring. Your team can track sync status, interpret error messages and adjust basic configuration independently. No black box, but a transparent system that you understand and control.
You work with a dedicated point of contact who understands both the Shopify-specific technical side and your business processes. This keeps lines of communication short and speeds up decisions when choices need to be made during the build.
You may also be interested in our broader services around API integrations, e-commerce development and custom software.
- Experience with the Shopify Admin API, Storefront API and Webhooks
- GraphQL-first approach for efficient data exchange
- Rate limiting and retry logic built in as standard
- Scalable architecture that grows with your order volume
- Monitoring and alerting on sync status and error rates
- Clear documentation your team can read and manage
- A fixed point of contact, no account managers passed around
- Support for Shopify Plus features and extensions
Security and privacy in Shopify integrations
E-commerce data includes customer details, payment information and order history that fall under the GDPR. Appfront treats every integration with that data as a starting point: we do not store unnecessary customer data, we limit API scopes to the minimum required, and we document all data flows for your record of processing activities.
Authentication runs through Shopify's OAuth 2.0 with scoped access tokens. Every app or integration only requests the permissions it actually needs — no more. Data is encrypted in transit via TLS, and Webhook payloads are verified using HMAC signatures to ensure they genuinely originate from Shopify.
More on our security approach: information security policy and CVD policy.
- GDPR-compliant data processing and data minimisation
- OAuth 2.0 with scoped access tokens (least privilege)
- HMAC verification of all incoming Webhooks
- Encryption in transit (TLS 1.2+) and at rest
- Role-based access and secrets management
- Audit logs with traceable data flows
- Automatic retries and dead-letter queues
- Documentation for your record of processing activities
Frequently asked questions about Shopify API integrations
Answers to the questions we are asked most often about custom integrations with Shopify.
A Shopify API integration is a technical integration that lets your Shopify store exchange data automatically with other business systems. This can be done via the Admin API (REST or GraphQL), the Storefront API or webhooks. Think of synchronising products, orders, stock and customer data with your ERP, accounting, fulfilment or marketing platform.
The Admin API provides access to the full management of your Shopify environment: products, orders, customers, inventory, discount codes and more. This API is intended for back-office integrations. The Storefront API is designed for customer-facing applications, such as headless storefronts, mobile apps or kiosks, and provides secure access to product data, collections and the cart without administrator rights.
A simple one-way integration, such as syncing products to a PIM system, can typically be operational within two to three weeks. More complex integrations with two-way sync, multiple sales channels and custom business logic usually take four to eight weeks. After an intake meeting we provide a concrete timeline.
Yes. A commonly requested integration is between Shopify and ERP or accounting packages such as Exact Online, SAP, Unit4 or Accountview. Orders from Shopify are automatically converted into sales invoices, customer details are synchronised, and inventory movements are updated in both directions.
The cost depends on the number of systems to connect, the complexity of the data flows, the required synchronisation frequency and the amount of custom work. A simple integration starts at a few thousand euros; a full multi-channel integration with custom business logic can cost more. We always provide a clear quote following a free, no-obligation analysis.
Yes. Shopify Plus offers additional API capabilities such as Checkout Extensions, Shopify Functions, Flow integrations and higher API rate limits. We also build integrations that specifically use these Plus features, for example for custom checkout logic, automated B2B price lists or advanced fulfilment workflows.
Shopify Webhooks send real-time notifications to your systems whenever something changes, such as a new order, a stock change or a customer sign-up. We use Webhooks as the primary trigger for event-driven integrations, so your business systems respond immediately to changes in the store without needing to poll continuously.
Yes. All integrations are built in line with the GDPR and security best practices. Authentication runs via OAuth 2.0 with scoped access tokens that carry only the rights they need. Data is encrypted in transit via TLS and at rest. We document the data flows so your record of processing activities stays complete.
Ready to build your Shopify integration?
Tell us which systems you want to connect to Shopify and which data flows you want to automate. We will help you think through the architecture and build an integration that grows with your revenue. A no-obligation first conversation will give you a clear picture of the possibilities within half an hour.