Shopify-NetSuite Unifies Storefront & Warehouse

Project Overview

Organization

Mid-market home and lifestyle retailer

Industry

Retail and eCommerce

Technology stack

Shopify Plus, NetSuite, integration middleware

Products / Services Used

Shopify Plus and NetSuite integration
Middleware development
Inventory synchronization
Order and fulfilment automation
Data reconciliation
API integration
Integration monitoring & error handling

The client was a home and lifestyle retailer generating around £2 million in annual revenue through a Shopify Plus store, wholesale, and marketplace channels.

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With plans to double order volume, launch a second brand, and open a third distribution centre, its disconnected Shopify–NetSuite workflows had become a bottleneck.

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Inventory, orders, fulfilment, and financial data relied on manual CSV uploads and duplicate data entry, creating frequent mismatches across teams.

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Mavlers Agency was brought in to establish a single, reliable source of truth across the business.

Performance Insights

Key results for the client

85%

Faster order processing time

99%+

Cross-system inventory accuracy

~ 90%

Reduction in manual data entry

Oversells since go-live

Client Objectives

The challenges the client faced

Talk to our team

Inventory updates were too slow

NetSuite was the inventory system of record, but Shopify received updated stock figures only twice a day through scheduled CSV exports. This created a high risk of overselling during promotions, resulting in cancellations, refunds, and customer support issues.

Orders required manual processing

Shopify orders had to be exported, cleaned, and imported into NetSuite. The process delayed fulfillment and created risks involving mismatched SKUs, incorrect tax codes, duplicate lines, and data-entry errors.

Finance was spending too much time reconciling data

Orders, fulfilments, and payments reached NetSuite through different routes. Invoices were raised manually, while the finance team investigated discrepancies before records could be reconciled.

Reporting was always behind

Sales, inventory, and margin reports were assembled manually from multiple exports. By the time they were ready, they often reflected the previous week rather than the current state of the business.

Growth was increasing the operational burden

Doubling order volume on the existing setup would have increased manual work, errors, and the need for additional operational headcount.

Mavlers Strategy

Built backwards from the warehouse floor

Talk to our team

Mapped the business before designing the integration

We worked with operations, warehouse, finance, and eCommerce teams to map the client’s order-to-cash, procure-to-stock, and return-to-refund processes.

The audit identified manual data transfers, API limitations, webhook requirements, and three different SKU conventions. A canonical product registry was established before the integration was built.

Defined a system of record for every data entity

The integration assigned ownership for each data type.

NetSuite owned products, pricing, inventory, invoices, and financial records
Shopify owned orders at the point of capture
Fulfilment originated in the warehouse and flowed through NetSuite
Tracking information flowed back to Shopify

Built a middleware layer instead of a direct connection

Rather than connecting Shopify and NetSuite directly, Mavlers built a middleware layer to transform data, apply business rules, queue messages, record activity, and retry failed operations.

This protected the workflow from temporary outages and reduced the risk of lost data.

Combined event-driven updates with scheduled polling

Shopify webhooks pushed order and fulfillment events in near real time. NetSuite saved-search polling identified inventory changes where event notifications were limited.

A nightly reconciliation process compared records across both systems and corrected any differences.

Automated the key operational workflows

The integration automated the movement of

Products and pricing from NetSuite to Shopify
Inventory updates from NetSuite to Shopify
Orders from Shopify to NetSuite
Fulfilment and tracking information from NetSuite to Shopify
Invoice and financial data within NetSuite

Shopify orders were converted into NetSuite sales orders as soon as the relevant webhook was received.

Added validation, retry logic, and monitoring

Before data was written to NetSuite, the integration checked SKU validity, tax codes, currencies, and quantities. Invalid records were quarantined instead of being pushed downstream. Idempotent operations prevented duplicate orders, while retry logic and dead-letter queues handled failed messages.

Structured logs, correlation IDs, queue monitoring, error tracking, and synchronization-latency alerts provided visibility across the entire workflow.

Tested the integration under realistic conditions

The integration went through unit testing, user acceptance testing, anonymised real-order testing, and peak-volume performance testing.

It also ran in shadow mode for one week before launch. Production rollout then took place in stages, beginning with inventory and followed by orders, fulfilment, and finance.

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Results

What the client achieved

We move faster, optimize smarter, and help you outpace competitors with AI behind every move.

Organization

Mid-market home and lifestyle retailer

Industry

Retail and eCommerce

Services Used

Shopify Plus and NetSuite Integration, Middleware Development

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About

The client generates roughly £2 million in annual revenue through Shopify Plus, wholesale, and marketplace channels. With plans to double order volume, launch a second brand, and open a third distribution center, its manual Shopify-NetSuite workflows had become a bottleneck.

Challenges

Inventory updated only twice daily via CSV exports, risking overselling during promotions.
Orders required manual export, cleaning, and import into NetSuite, delaying fulfillment.
Finance reconciled orders, fulfilments, and payments arriving through inconsistent routes.
Reports were assembled manually and often reflected the prior week, not current state.
Scaling order volume on the existing setup would have multiplied manual work and errors.

Goals

Establish a single source of truth across storefront and ERP.
Move to near-real-time inventory and order synchronization.
Cut manual data entry and reconciliation workload.
Build a model that scales with volume growth without added headcount.

Solution/Approach

Mapped processes: order-to-cash, procure-to-stock, and return-to-refund processes across teams.
Assigned system-of-record ownership: NetSuite for products, pricing, inventory, and financials; Shopify for orders at capture.
Built a middleware layer: Transformed data and retry failed operations, instead of connecting the systems directly.
Combined Shopify webhooks: For near-real-time updates with NetSuite polling and nightly reconciliation
Data sync automation: Automated the movement of products, pricing, inventory, orders, fulfilment, and financial data between systems.
Added SKU, tax, and currency validation and structured monitoring before go-live.
Tested through unit, UAT, real-order, and peak-volume testing, then ran shadow mode for a week before staged rollout.

Results

85% faster order processing time.
99%+ accuracy in cross-system inventory.
~90% reduction in manual data entry.
Zero oversells since go-live.
Scalable foundation for second brand and third distribution centre.

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The bigger win: The retailer transformed from manual, error-prone workflows to automated, reliable operations - enabling 2X order volume growth without adding operational headcount or risking oversells.

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Shopify-NetSuite Unifies Storefront & Warehouse

Project Overview

Key results for the client

The challenges the client faced

Built backwards from the warehouse floor

What the client achieved

About

Challenges

Goals

Solution/Approach

Results

Results that speak for them selves.

Migrating 9,000+ pages across 12 languages

80% CPR reduction and 3x ROI over 6 years

35% cost reduction while scaling SEO delivery globally

Ready to connect Shopify and NetSuite?

Get in touch with us.

You’re all set!

Results that speak for them selves.