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01/07/2025

API Integration Between Shopify and Inventory Management System

API Integration Between Shopify and Inventory Management System

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1. Project Overview

A mid-sised eCommerce brand in the fashion accessories space was facing constant inventory sync issues between their Shopify store and their offline inventory management system (IMS). Manual stock updates were resulting in overselling, delays, and frustrated customers.

They reached out to Merto to build a seamless, real-time integration that would eliminate manual updates and streamline their operations.

2. The Challenge

The client was using a legacy IMS that lacked native Shopify support. Key issues included:

  • Delayed inventory syncs causing stock discrepancies
  • No real-time order updates between systems
  • Difficulty tracking stock across multiple warehouse locations
  • Risk of human error from manual entry

They needed a custom middleware solution with robust, reliable API integration between both platforms.

3. Our Approach

Our team conducted a systems audit to understand both Shopify’s API structure and the IMS’s API/documentation. We mapped the required data points (product IDs, SKUs, stock levels, order statuses) and designed a secure, two-way sync architecture.

Agile development and continuous testing ensured clean integration without disrupting ongoing operations.

4. The Solution

We built a custom middleware API that:

  • Automatically syncs stock levels every 5 minutes
  • Instantly pushes new orders from Shopify to IMS
  • Pulls real-time order status and fulfillment info back into Shopify
  • Includes alerting system for sync errors or conflicts
  • Supports multi-location inventory rules
  • Is fully cloud-hosted with 99.9% uptime SLA

5. Results & Impact

  • 100% reduction in overselling incidents
  • Reduced order fulfillment delays by 48%
  • Freed up 15+ hours/week in manual labor
  • Improved customer satisfaction and fewer refund requests
  • Sales team now trusts the data and focuses on growth rather than inventory headaches

6. Client Feedback

“We finally feel in control of our inventory. Merto delivered exactly what we needed — fast, reliable, and solid support.”
– Operations Manager, AccessoriesCo

7. Tech Stack / Tools Used

  • Node.js backend for API handling
  • Shopify Admin API
  • Legacy IMS REST API
  • AWS Lambda for scalable middleware
  • Postgresql for transaction logging and error tracking

8. Screenshots / Visuals

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9. Next Steps / Ongoing Support

We’re now enhancing the system to support auto-purchase order creation and deeper analytics into stock turnover and forecasting.