Shopify ERP Integration: The Complete Guide for Growing Retailers

Shopify ERP Integration: The Complete Guide for Growing Retailers

At around 50–100 orders per day, most Shopify stores hit the same wall. Orders are coming in, but someone is manually entering them into an accounting system. Stock levels are maintained in two places. Customer data lives in three spreadsheets. Finance asks why the month-end reconciliation takes three days.

The solution is almost always the same: a proper ERP integration. But getting it right takes more than plugging in a standard connector. This guide covers what you need to know before you start — and how to avoid the mistakes that make integrations fail.

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What Does an ERP Integration Actually Do?

An ERP (Enterprise Resource Planning) integration creates a real-time or near-real-time sync between Shopify and your back-office system. Depending on your setup, this typically includes:

• Orders: New Shopify orders are automatically created in the ERP as sales orders or invoices
• Stock levels: Inventory updates in the ERP are pushed back to Shopify in real time
• Customers: New customers are synced, preventing duplicates
• Products: Product data (prices, descriptions, variants) flows from the ERP into Shopify
• Returns: Return orders and credit notes are automatically processed on both sides

The result is a single source of truth — without the copy-paste work.

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The Most Common Shopify ERP Integrations

Shopify + Exact Online

Exact Online is the dominant accounting and ERP platform in the Netherlands and Belgium, and one of the most requested Shopify integrations we build at Duxly.

A standard Shopify–Exact Online integration handles:

• Order export from Shopify → sales entries in Exact
• Automated invoicing and payment matching
• Stock synchronisation (with Exact as the master)
• Customer and debtor sync

What’s often underestimated: Exact Online’s API is well-documented but has rate limits and quirks around VAT handling for B2B and cross-border orders. A standard connector will get you 70% of the way there. The other 30% — your specific pricing structures, VAT scenarios, or custom workflow — usually requires custom development.

Shopify + AFAS

AFAS Profit is used by larger Dutch businesses, particularly those with complex HR and payroll needs alongside their financial administration. Shopify–AFAS integrations are less common but growing.

The main challenge: AFAS has a proprietary connector model (GetConnector/UpdateConnector), which means fewer off-the-shelf solutions exist. Most Shopify–AFAS integrations are custom-built.

Shopify + Exact Multivers

Multivers is Exact’s solution for mid-market companies with more complex multi-entity or multi-currency needs. Shopify–Multivers integrations are well-suited for retailers with international operations or multiple brands under one roof.

Shopify + SAP, Microsoft Dynamics, NetSuite

For enterprise retailers, integrations with SAP Business One, Microsoft Dynamics 365, or Oracle NetSuite are increasingly relevant — especially after migrations from Magento or WooCommerce. These integrations are more complex but the ROI is significant at scale.

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The Four Most Common Integration Mistakes

1. Assuming the “standard connector” will be enough

Most ERP vendors offer a certified Shopify connector or App Store integration. These cover the most common scenarios — but they’re built for the average case. If you have:

• B2B customers with custom pricing per account
• Bundles or product kits that map differently in Shopify and the ERP
• Multiple warehouses or fulfilment locations
• Custom VAT rules for specific markets

…then a standard connector will leave you building workarounds within weeks of going live.

2. Starting with inconsistent SKUs

The integration’s backbone is the product identifier. If your Shopify SKUs don’t match the article codes in your ERP, you’re building on sand. Before you start the integration project, audit both systems and create a mapping table. It’s boring work, but it prevents disasters.

3. Making Shopify the master of inventory

In most setups, the ERP should be the master for stock levels — not Shopify. Shopify is optimised for selling; the ERP is designed for inventory management. If you let Shopify manage stock independently and then try to sync back to the ERP, you’ll get conflicts every time there’s a delay in the sync.

The right model: inventory is updated in the ERP (by incoming goods, physical counts, or returns), and those updates are pushed to Shopify in near-real-time.

4. Forgetting about returns and credit notes

Every demo of an ERP integration shows the order flowing beautifully from Shopify into the ERP. Almost no demo shows what happens when the customer returns the product three weeks later.

Returns are where integrations fall apart. Make sure your integration handles:

• Shopify return requests → ERP return order
• Automatic credit note creation
• Stock updates on return receipt
• Refund processing back to the customer

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What to Expect from the Integration Project

Timeline

A standard Shopify–Exact Online integration typically takes 4–8 weeks, depending on:

• Complexity of your product catalogue (variants, bundles, custom attributes)
• Number of VAT scenarios
• Existing data quality
• Whether you need a phased migration or a big-bang cutover

Custom integrations (AFAS, Multivers, multi-entity setups) take longer — plan for 8–16 weeks.

Cost

Integration costs vary widely. A standard connector from an App Store might cost €50–200/month. A custom-built integration typically runs €5,000–25,000 for initial development, plus maintenance.

The right question isn’t “how cheap can we do this?” but “what does one month of manual data entry cost us?” For most stores at 100+ orders/day, the ROI on a proper integration is measured in weeks.

What You Need to Prepare

Before starting an integration project, prepare:

1. Clean data: Consistent SKUs, complete customer records, up-to-date product catalogue
2. Clear ownership: Who manages products in which system? Who is the master for inventory?
3. Test scenarios: A list of edge cases specific to your business (B2B orders, returns, partial shipments)
4. Stakeholder alignment: Finance, operations, and the web team all need to agree on the data model before development starts

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Signs You’re Ready for an ERP Integration

You need an ERP integration when:

• ✅ You’re spending more than 2 hours/day on manual data transfer between systems
• ✅ Stock discrepancies are causing customer complaints
• ✅ Your month-end close takes more than a day to reconcile
• ✅ You’re scaling to new channels (wholesale, B2B, multiple countries) and current processes won’t hold
• ✅ You’re planning a platform migration and want to modernise your tech stack at the same time

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How Duxly Builds ERP Integrations

At Duxly, we build custom ERP integrations for Shopify and Lightspeed retailers — primarily with Exact Online, AFAS, and Exact Multivers. Our approach:

1. Discovery session: We map your exact data flows, edge cases, and current workarounds
2. Data model design: We define the master for each data type and handle the SKU/code mapping
3. Phased build: We build and test core flows (orders, products, stock) before adding complexity
4. Go-live support: We’re available during the first weeks after launch to handle edge cases
5. Ongoing maintenance: APIs change. We monitor and maintain the integration long-term

We don’t sell connectors. We build integrations that fit your business.

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Get Started

If you’re evaluating an ERP integration for your Shopify store, the first step is always a discovery call. We’ll assess your current setup, identify the complexity, and give you an honest view of what’s involved.

Schedule a discovery call — no commitment, no pitch deck.

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Duxly specialises in e-commerce integrations and migrations for retailers in the Netherlands and Belgium. We connect Shopify and Lightspeed to ERP systems, fulfilment platforms, and custom business logic.