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Shopify Plus Custom App Development

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description Shopify Plus Custom App Development Overview

For merchants on Shopify Plus, building custom apps that interact deeply with the backend via private APIs and webhooks is often the most powerful route. While not strictly a 'storefront API' in the traditional sense, these apps allow for backend logic (e.g., custom fulfillment, complex pricing rules) that the storefront must consume. This path requires dedicated developer resources and deep Shopify knowledge.

help Shopify Plus Custom App Development FAQ

What is the difference between a Shopify Public App and a Custom App?

A Shopify Custom App is built specifically for one merchant's Shopify Plus store and is not listed on the public Shopify App Store. This allows developers to interact deeply with private backend APIs without needing to go through Shopify's app approval process. It is ideal for custom fulfillment logic and enterprise integrations.

Can a Shopify Custom App connect to a third-party ERP system?

Yes, one of the primary reasons to build a custom app is to bridge your Shopify Plus frontend with an external ERP or CRM system, like SAP or NetSuite. The app can listen for webhooks—like a new order being placed—and instantly send that data to your external inventory database. This ensures your backend systems are always in sync.

Do Shopify Custom Apps require authentication via OAuth?

Yes, even though a custom app is private, it still must authenticate with the Shopify Admin API using secure authentication protocols. The app utilizes OAuth tokens to ensure that it has explicit permission to read or modify store data like orders and customer information. This prevents unauthorized access to sensitive backend logic.

Does Shopify charge extra fees to host and run Custom Apps?

No, Shopify does not charge a recurring fee to host a custom app on your Shopify Plus store, but you must host the backend server code yourself on platforms like AWS or Heroku. However, if your custom app makes millions of API calls, you might incur standard usage costs or hit API rate limits. The app itself operates within your existing Shopify Plus subscription.

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