How much does ERP integration cost for ecommerce? An Australian price guide

An ERP integration for a B2B store costs anywhere from a monthly subscription to a quarter of a million dollars. Where you land depends less on which ERP you run than on how the integration is built, and on four cost lines that most quotes leave out: the connector or middleware subscription, the platform licence underneath it, the API fees your ERP now charges, and the work of keeping it running after go-live.

This guide prices every one of those lines from published sources, as of October 2026, for Australian and New Zealand wholesalers. Where a vendor doesn’t publish a price we say so, rather than guessing. We make TierCommerce, a B2B platform with ERP integrations built in, so we’re not neutral; every figure is linked so you can check it yourself.

The short answer

One Australian ecommerce agency publishes these bands for the integration alone, excluding the store:^[1]

Those are build costs. Over three years the build is often the smaller part of the bill, because the subscriptions and maintenance keep going. Budgets also slip in a predictable place: in Panorama Consulting’s 2026 survey of 170 mid-market ERP projects, 30% went over budget, and the most common reason, given for 54.9% of them, was that additional technology had to be bought to meet the project’s goals.^[2] For a store, that extra technology is usually the connector or middleware nobody priced at the start. It’s a global sample, mostly North American, but the pattern is familiar.

The five cost lines in every ERP integration

Whatever route you take, the total is some mix of these:

1. Build. Mapping your ERP’s products, customers, prices, stock, orders and invoices to the store, writing the integration and testing it against real data.
2. Connector or middleware. A subscription to an app or integration platform (iPaaS) that moves the data, if the store doesn’t connect to the ERP itself.
3. Platform licence. The ecommerce platform the integration feeds, which on enterprise plans can be the largest line.
4. ERP-side fees. API licences, integration users and, since March 2026, Xero’s charges for API use.
5. Maintenance. ERP upgrades, API changes, new price structures, new warehouses, and fixing syncs that fail.

Line 1: the build, priced in days

Agency quotes come as a lump sum, but every one is days multiplied by a rate. Hays publishes what IT contractors are paid a day in New South Wales:^[3]

With that team mix, a project day costs A$795–1,110. A 25-day basic integration is about A$20,000–28,000, which sits at the bottom of the published agency band. A 100-day standard integration with contract pricing and invoices is A$79,500–111,000, inside the A$50,000–120,000 band. Those are contractor pay rates, so an agency’s charge-out rate, with its margin and overheads, sits above them.

The days go where the B2B rules are. Connecting to an API takes days; reproducing how your ERP picks a trade price, handling customers on stop credit, mapping units of measure and making sure an order can never arrive twice take weeks. Our ERP integration guide covers what each of those involves.

Line 2: connectors and middleware

If your platform doesn’t connect to your ERP itself, something has to sit in between: a connector app built for one ERP and one platform, or an integration platform that can join anything to anything.

Middleware list prices

None of the big integration platforms publish prices on their own websites. The only public list prices we could find are their AWS Marketplace listings, in US dollars a year:

Volume pricing is where B2B gets expensive. A trade store doesn’t just send orders; it moves stock changes, price changes and customer changes all day. On Boomi’s pay-as-you-go price, 100,000 messages a month is A$7,390 a month, or about A$88,406 a year.

Connector apps for Australian ERPs

Connector apps are cheaper than middleware but priced per store, often per order, and they sync what their developer chose to sync. These are some published prices for ERPs common in Australia and New Zealand:

Our audit of 62 connector and B2B app listings on the Shopify App Store and BigCommerce marketplace has the full list, including which connectors say they sync customer-specific prices. Many don’t, which means trade prices end up kept in two places.

Line 3: the platform licence

The connector feeds a platform, and enterprise platform licences are often the largest single line. Shopify Plus costs A$3,700 a month on a three-year term in Australia, or A$4,000 on one year, which is A$133,200–144,000 over three years before any apps.^[15] Adobe Commerce is licensed by quote on your order volume. We break these down in what Shopify Plus B2B really costs and what a B2B portal costs in Australia.

Line 4: your ERP’s own fees

The ERP side has costs too, and they’re easy to miss:

• Xero now charges for API use. Since 2 March 2026 Xero bills each app by how many organisations it connects and how much data it moves: free for up to 5 connections, then A$35 a month for 50, A$245 for 1,000 and A$1,445 for 10,000, plus A$2.40 for each GB over the allowance.^[16] If your integration is your own custom app, you’re the developer paying it.
• API licences and integration users. Pronto Connect, the MYOB Exo API and some on-premises ERPs license API access separately. Pronto publishes no price or limits for Pronto Connect,^[17] so ask for both in writing.
• Higher ERP tiers. API limits are often set by your ERP licence. On MYOB Acumatica, NetSuite and others, a busy store can push you into a higher tier or an add-on such as NetSuite’s SuiteCloud Plus, which Oracle prices by quote.^[18]

Line 5: maintenance

You’ll often read that maintenance costs 15–20% of the build a year. We couldn’t find a credible source for that figure, so we don’t use it. What we can say from integrations we’ve run since 2017 is what drives the work:

• The ERP changes. Vendors move to new APIs and authentication, retire versions and change limits. Microsoft’s Shopify connector, for example, uses a Shopify API version that is only accessible until 31 December 2026, so Business Central must be upgraded for the sync to keep working.^[14]
• The platform changes. Shopify retires API versions on a schedule, and every app in the chain has to keep up.
• Your business changes. New warehouses, price structures, customer types and entities all need mapping.
• Syncs fail. Someone has to read the log, find the cause and re-run it.

Budget it in days a year, not as a percentage, and ask whoever builds the integration how many days they spent last year keeping a comparable one running.

Work out your own yearly bill

Enter what your integration would move each day. The calculator prices the volume on Boomi’s pay-as-you-go rate, shows the Patchworks tier it fits and the middleware list prices, and prices the build and maintenance at the Hays contractor rates above. It opens on a mid-sized wholesaler with 1,000 online orders a month.

To check whether that volume also fits inside your ERP’s API limits, use the ERP API sync budget calculator.

Three routes, priced side by side

Put the lines together and there are three ways to pay for an ERP integration. We make the third, so weigh our view accordingly.

• Yes: Better for a wholesaler
• Partly: Depends, or ask
• No: Watch out

On TierCommerce the ERP integration is included in the subscription, with integrations our own team builds and maintains. Plans start from A$500 a month for Xero and MYOB Business and A$1,500 a month for Pronto Xi, NetSuite, Options, MYOB Acumatica, Business Central, SAP Business One, Cin7 and Unleashed. See pricing and integrations.

What you get for the money

Two routes can cost the same and give your trade customers very different things. Before you compare quotes, compare what each platform lets your customers do, and what your team still does by hand. This is every B2B feature, platform by platform.

How to get an honest quote

Whoever you ask, request a three-year cost broken into the five lines above, and these answers in writing:

1. Which records sync each way, and how often? Does that include customer-specific prices and quantity breaks?
2. What does the connector or middleware cost at our volume, and what happens when we exceed a plan’s order or operation cap?
3. Which ERP licences, API users or tiers do we need, and who pays any API fees?
4. How many days a year did a comparable integration take to maintain last year?
5. When a sync fails, who sees it first and who fixes it?
6. What happens to the integration if we change ERP or platform?

If you’d like TierCommerce’s answers for your ERP, book a demo. Tell us which ERP you run and the features that matter most, and we’ll walk you through a working store.