Shopify Custom App Creation: A Step-by-Step Build Guide

Shopify custom app creation lets you build a private integration that solves a specific problem for your store — without waiting for a public app or paying monthly fees to a third party. This guide walks you through the entire process, from choosing the right app type to deploying to production. Whether you're a merchant with a unique workflow or a developer building for a client, these steps will get you from idea to a working custom app.

Custom app vs public app vs private app: which one you need

Before you start building, understand the three types of Shopify apps:

• Public app: Listed on the Shopify App Store, built for many merchants, requires OAuth and Shopify review. Best if you're selling a product.
• Custom app: Built for a single store (or a few stores under one organization). Installed directly from the Partner dashboard. No App Store review. Ideal for bespoke integrations.
• Private app: Created directly in the store admin (Settings → Apps and sales channels → Develop apps). Quick to set up, but limited in scope and not suitable for complex apps or multiple stores.

For most merchants with unique needs, a custom app is the sweet spot: more capable than a private app, less overhead than a public app. If you're unsure, our Shopify app development service can help you decide.

Setting up the app in the Shopify Partner dashboard and dev store

1. Create a Partner account at partners.shopify.com if you don't have one.
2. Create a development store for testing. Go to Stores → Add store → Development store.
3. Create a new app: From the Partner dashboard, go to Apps → Create app → Create app manually. Give it a name.
4. Configure app URLs: Set the App URL (your app's public URL) and the redirect URL(s) for OAuth. For custom apps, you'll also set the allowed redirection URL(s) in the app setup.
5. Install the app on your development store to generate API credentials.

You now have an API key and secret. Keep them safe — never commit them to version control.

Access scopes: request only what the app truly needs

Shopify requires you to declare access scopes during OAuth. Requesting too many scopes can scare merchants and violates the principle of least privilege. Start with the minimum:

• read_products for reading product data.
• write_orders if you need to update order status.
• read_customers for customer data.

You can always request more later, but you'll need to re-authorize the app. For custom apps, you can set scopes in the Partner dashboard under App setup → Admin API access scopes.

Building the first endpoint: webhooks, Admin API and auth flow

A typical custom app has three core components:

1. Authentication: For custom apps, you can use the OAuth flow or, for apps installed on a single store, use the Admin API access token generated in the Partner dashboard. The latter is simpler for internal apps.
2. Webhooks: Subscribe to events like orders/create or products/update. Your endpoint must verify the webhook using the shared secret. Example: register a webhook via the Admin API or in the Partner dashboard.
3. Admin API calls: Use the REST or GraphQL Admin API to read and write data. For example, fetch orders or update inventory.

Start with a simple endpoint that receives a webhook and logs the payload. Then add API calls. Use the official Shopify CLI to scaffold your app and handle boilerplate.

Testing, review and deploying to production

• Test in your development store: Install the app, trigger webhooks, and verify API responses.
• Handle errors gracefully: Implement retries and logging. Shopify webhooks can be retried if your endpoint fails.
• Review access scopes: Ensure you're not requesting unnecessary permissions.
• Deploy to a production environment: Use a cloud provider like Heroku, AWS, or Vercel. Set environment variables for API keys.
• Install on the live store: For custom apps, you'll need to transfer the app to the merchant's store or create it under their organization.

When to build in-house vs hire a Shopify app development team

Building a custom app requires ongoing maintenance: API version updates, security patches, and feature changes. Consider these factors:

If your app is simple and you have developer resources, in-house can work. But for complex integrations or if you lack Shopify expertise, hiring a specialized team saves time and reduces risk. Our team at Digital Executive Partner offers Shopify app development with a focus on custom solutions that fit your workflow. We also build AI agents and Zoho integrations that can connect to your Shopify store.

Conclusion

Shopify custom app creation is a straightforward process once you understand the steps: choose the right app type, set up your Partner dashboard, request minimal scopes, build your endpoints, test thoroughly, and deploy. If you'd rather skip the learning curve, we're here to help.

Related reading

• Custom Shopify App Development Services: What You Get
• Shopify Custom App Development Company: What to Look For