A growing eCommerce brand approached us to solve a critical issue of overselling products due to outdated stock information. Their inventory was managed through an external system, but Shopify’s native stock syncing was not real-time enough to handle high-demand products and bulk buyers.
The Challenge
The client needed a custom Shopify app that would:
- Validate stock levels in real time during the cart and checkout process
- Prevent orders from going through if the stock is insufficient
- Integrate with their existing external inventory API
- Deliver a smooth experience for both customers and store admins
The Solution
We developed a private embedded Shopify app using Node.js and React (Polaris) that hooked into the cart flow and performed stock checks using the client’s API.
Key features:
- Smart API integration with real-time stock verification
- Check out block for out-of-stock items with user-friendly alerts
- Fail-safe server-side validation to prevent bypass via scripts
- Support for partial stock (e.g., order limit based on availability)
- Webhook support to revalidate stock on order cancellation/refund
The Results
- 100% reduction in overselling incidents
- Fully modular, can be extended to handle bundles or location-based stock
- Real-time sync with inventory system (<1s delay)
- Improved user experience, no delays or errors during checkout
Client Testimonial
“Working with this team was a game changer for our business. Overselling used to be our biggest headache, but their custom Shopify app solved it completely. Now, our store always shows the right stock in real time, and our customers enjoy a much smoother checkout process. The integration with our existing systems was flawless, and we haven’t had a single oversell incident since launch. Highly recommend their work!”
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