Glossary
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shopify-api
Shopify API: interfaces for reading and modifying store data (orders, products, customers). GraphQL, apps, webhooks, and merchant advice.
Updated on
June 4, 2026
The Shopify API (Application Programming Interface) refers to the set of programming interfaces that allow external applications, services, or systems to read and modify data from a Shopify store: products, orders, customers, inventory, shipping, etc. As a merchant, you do not use the API directly on a daily basis: it is the technical engine behind apps in the Shopify App Store, ERP/CRM integrations, and custom developments made by a Shopify agency.
The Shopify API allows you to connect the store to other tools and automate workflows that would be too heavy to manage manually. It is at the heart of serious integrations: ERP, PIM, applications, reporting, or catalog synchronization.
Summary
Shopify API Definition
An API is a standardized technical contract: your software sends a request (e.g. "list today's orders"), and Shopify responds with structured data (JSON). Without APIs, every tool would have to manually connect to the store, which would be impractical.
On Shopify, APIs cover two areas:
To fully understand this concept, it is mostly found on the Admin / back-office side: managing the catalog, orders, customers, discounts (via apps installed by the merchant) and the Storefront side: headless shopping experience, front-end apps, dynamic cart (storefront).
Useful distinctions for an e-merchant:
To fully understand this concept, we notably find Shopify API vs Shopify app: the API is the protocol; the app is the product you install and which consumes the API with your authorization, API vs integration: the integration is the business outcome (ERP sync, email sending); the API is the technical means, and API vs webhook: the API allows you to query or modify data on demand; the webhook notifies your system when an event occurs (new order, refund).
Why the Shopify API is useful in e-commerce
Even without coding, the Shopify API impacts your daily life through the tools you activate.
For an online store, this notably includes Apps from the Shopify App Store: customer reviews, email marketing, logistics, accounting, chat support, product recommendations, Business integrations: stock synchronization with a WMS, accounting export to QuickBooks, marketplace connection (ERP integration), Automations: automatic label creation, order status updates, customer service alerts and Custom experiences: personalized checkout, headless commerce, mobile apps.
Without reliable APIs, you would manually copy orders and stocks between Shopify and your other software: errors, delays, out-of-stocks. Understanding the role of the API helps to choose the right apps, validate the permissions requested upon installation, and anticipate limitations (rate limits, non-synchronized fields).
The main uses of the Shopify API
Main APIs documented on Shopify.dev:
Concretely, we notably find the GraphQL Admin API: the current standard for admin apps (products, orders, customers, inventory). Recommended for new integrations, REST Admin API: legacy still supported; Shopify steers new projects towards GraphQL, Storefront API: buyer-side data for headless sites or front-end apps (catalog, cart), Ajax API: lightweight dynamic additions on classic themes (cart, recommendations) and Webhooks & Events: real-time notifications on order creation, product updates, etc.
Authentication: an installed app obtains an OAuth token with explicit scopes (permissions): read_orders, write_products, etc. You validate these rights upon installation.
Use Case: a brand connects Shopify to its ERP via an ERP integration app. With every new paid order, a webhook triggers the app: it reads the order lines via the Admin API, creates the fulfillment order in the ERP, and sends back the tracking number to Shopify. The merchant sees the "shipped" status without manual entry.
API management in a Shopify project
In practice, you interact with the Shopify API indirectly:
In Shopify, you notably install an app from the App Store or a partner link, Shopify displays the authorization screen: what data the app can read or modify, the app exchanges API requests in the background according to its function (inventory sync, SMS sending, etc.), and you configure the app in the admin; data flows between Shopify and the third-party service.
Useful technical points to know (without developing):
In Shopify, you notably find Rate limits: number of allowed requests per second; a poorly built app can slow down massive syncs, API Versions: Shopify versions its APIs; serious apps keep themselves up to date, Minimal scopes: an app should only request the necessary permissions, and Public vs custom apps: app store or private development for a single merchant (via Partner).
For a customer support or assisted sales integration, solutions like Qstomy also rely on the Shopify ecosystem to read the catalog and contextualize exchanges (Qstomy Shopify integration).
Best practices and common mistakes
Read the permissions before installing an app: what scopes are requested and why.
Favor 'Built for Shopify' apps or highly rated, recently updated ones.
Test in a development store before connecting the production ERP.
Document the data flows: which app is the source of truth for stock, prices, and customers.
Revoke access for unused apps (Settings > Apps and sales channels).
Have a Plan B if an app stops working (CSV export, secondary integration).
Common mistakes:
Stacking multiple apps that modify the same data (stock, price) without priority rules.
Installing an app that requires write_orders or write_products without understanding the risks.
Expecting instant sync on huge catalogs (API and batch limits).
Confusing Admin API and Storefront API during an ill-defined headless project.
Forgetting GDPR compliance: apps accessing customer data must respect your obligations.
The key takeaways about the Shopify API
Key takeaways include: Shopify API = interfaces to read/write shop data by apps and integrations, GraphQL Admin API is the current standard; Storefront API is for the buyer experience, Merchants access them via apps and OAuth permissions, not by coding, Webhooks complement the API for real-time notifications, and Choosing and auditing apps wisely = mastering what's transmitted via the API.
Associated terms, FAQ, and going further
Associated Terms
Notions related to this topic notably include Shopify App: consumes the API with your authorization, Webhook: automatic alert on store events, Shopify App Store: catalog of apps using the API, and ERP Integration: frequent business use case of the API.
FAQ
Do I need to know how to code to use the Shopify API?
No. Apps and integrations encapsulate the API. Only developers, agencies, or app publishers work directly on Shopify.dev.
GraphQL or REST: which one affects my store?
As a merchant, you do not have to choose: it is the app publisher who uses the GraphQL Admin API (recommended) or REST (legacy). For a custom project, ask your agency to use GraphQL.
Is the Shopify API secure?
Shopify enforces HTTPS, OAuth authentication, and granular scopes. Security also depends on the quality of the installed apps: check reviews, the publisher, and permissions.
Shopify API and GDPR: what to check?
Any app accessing customer data must have a clear privacy policy, compliant hosting, and a data processing agreement if applicable. Limit scopes to what is strictly necessary.
Going Further
Notions related to this topic notably include Shopify Integrations Explained, E-commerce Integrations Guide: CRM, analytics, payments, Connecting your e-commerce tools, Shopify Development Resources, Shopify Qstomy Integration, and Return to the Qstomy e-commerce glossary.
Sources: Shopify.dev (API reference), Shopify Help Center (Apps).
Enzo
June 4, 2026
