5 Things to Do Before You Connect Your E-Commerce Site to an ERP

There's a pattern we see repeatedly with growing e-commerce businesses. They start on Shopify or BigCommerce with a simple setup — orders come in, someone checks inventory manually, fulfilment happens through ShipStation or a similar tool, and the finance team reconciles everything in QuickBooks at month end. It works. Until it doesn't.

The breaking point usually looks the same: three screens open, someone toggling between the e-commerce backend, an inventory system, and a shipping platform just to process a single order. Then manually marking it as fulfilled. Then updating inventory. Then hoping the numbers still make sense when accounting looks at them on Friday.

At that point, integrating with an ERP becomes less of a nice-to-have and more of a survival requirement. But the integration itself isn't the hard part. The preparation is. Here are the five things that matter most before you connect your e-commerce site to an ERP.

1. Be Specific About What You Want the Integration to Achieve

"We need an ERP" isn't a goal. It's a feeling. Before you evaluate a single platform, sit down and identify the specific pain points you're trying to solve. Is it order visibility — so the warehouse can see what's coming without someone manually forwarding emails? Is it inventory accuracy — so your website reflects what's actually in stock? Is it omnichannel expansion — so you can sell on Amazon, eBay, or Etsy without multiplying the chaos?

A useful exercise: list the four or five tasks that consume most of your team's day. Then estimate how much of that time would be eliminated by a properly integrated system. You're looking for the 80/20 — the 80% of effort that becomes 20% once the data flows automatically. That's your business case, and it's what keeps the project focused when things inevitably get complicated.

2. Clean Up Your E-Commerce Data

This is the one everyone knows they should do and nobody wants to. Your e-commerce site, like any database, accumulates junk over time. SKU numbers with no consistent logic. Products that should be variants sitting as standalone items. Shipping zones created for one-off situations that never got cleaned up. Customer records with missing addresses. Tags applied inconsistently or not at all.

All of this matters because whatever goes into your ERP is what your team will be working with going forward. If the data is messy on the way in, it'll be messy on the other side — and now it's messy in your system of record. No ERP fixes bad source data.

But it's not just about cleaning what's there. It's about validation. If your ERP already has master data — customer records, product hierarchies, geographic codes — the data coming from your e-commerce site needs to align. Different naming conventions for states, different phone number formats, different product categorisation structures — these are the things that cause silent failures and manual workarounds that never go away.

Think of it as setting the foundation. It's not glamorous work. But skipping it means building everything that follows on top of a mess.

3. Choose the Right Connector

This is where I've seen projects go sideways most often. The assumption tends to be that a connector is a connector — it says Shopify on one end and Acumatica on the other, so it must work. It doesn't always follow.

There are broadly four options. Native connectors from the e-commerce platform, which tend to operate like lightweight mini-ERPs in the backend. IPaaS middleware like Celigo or Boomi, which offer pre-built integration flows with field-level mapping flexibility. Native connectors from the ERP publisher — Acumatica's Shopify connector, Business Central's Shopify sync — which are purpose-built and maintained as part of the ERP's upgrade cycle. And custom-built APIs, which give you complete control but cost significantly more in developer hours and ongoing maintenance.

My strong recommendation: go native from the ERP publisher where it's available. It's maintained by the same vendor, it upgrades with your system, and it's one less third-party relationship to manage. The IPaaS route is solid when native isn't an option. Custom should be a last resort.

The critical thing to understand is how the connector processes data. Real-time versus batch makes a material difference. A connector that runs overnight means your warehouse doesn't see an order until the next morning. If you're promising next-day delivery, you've just burned a full day before picking even starts. Make sure you know what you're buying.

4. Test Real Customer Journeys — Especially the Messy Ones

Testing an ERP integration is not the same as testing an ERP implementation. You're testing two systems and the connection between them. Does an order placed on Shopify appear correctly in the ERP? Good. Now test the things that actually happen in real life.

A customer cancels an order after it's already in shipping status. Does the cancellation push back to the ERP, or does the warehouse fulfil an order the customer doesn't expect? A customer applies a gift card and a promo code on the same order — does that calculate correctly on both sides? A customer types "please combine with my other order" in the notes field — can anyone in the warehouse even see that?

Test at volume. If you process 400 orders a day, put 400 orders through the integration. A connector that handles 10 test orders cleanly may behave differently at scale.

Test the financial flows. Sales tax across different jurisdictions. Payment methods beyond standard credit card — PayPal, shop credit, gift cards. Returns and the resulting credit memos. If you sell drop-shipped products, do those orders route correctly?

The golden rule: if the customer can do it on your website, you need to test what happens when they do. Because they will find the edge case you missed, and it'll happen on the busiest day of the quarter.

5. Plan for People, Not Just Technology

The integration doesn't end at go-live. Someone in your organisation needs to own it — monitoring exceptions, resolving sync errors, training new staff, and identifying opportunities for improvement.

This is especially important because e-commerce ERP integrations aren't static. Your business will grow. You'll add channels. Your product catalogue will expand. The connector may need configuration changes. If nobody owns it, small issues compound into big ones, and before long your team is back to managing workarounds manually.

Training matters at launch, obviously. But it also matters six months later when someone new joins the team and defaults to the old way of doing things because that's what they know. Plan for ongoing enablement, not just a one-time training session.

And a practical tip that we think is underrated: tell your customers. Before go-live, communicate that you're upgrading your systems. Set expectations. One business we worked with put a simple banner on their Shopify site: "We've moved to a new inventory and accounting system. We don't expect any delays, but please bear with us if anything takes a little longer than usual." It reduced support queries, set a professional tone, and showed customers the business was investing in getting better. It also protected against the AR risk of customers flagging new-looking invoices as spam — something that absolutely happens when document formats change overnight.

The Short Version

Integrating your e-commerce site with an ERP is a significant step. But the integration itself is the relatively straightforward part. The preparation — defining your goals, cleaning your data, choosing the right connector, testing thoroughly, and planning for the people side — is what determines whether you end up with a seamless operation or an expensive headache.

Do the groundwork properly and the integration becomes a launchpad. Skip it, and you're just importing your existing chaos into a more expensive system.