OpenCart Xero Integration: Your Options Compared

Option 1: an OpenCart Marketplace extension

Several Xero extensions are listed on the OpenCart Marketplace. Each listing shows which OpenCart versions it supports, and that matters, because an extension built for OpenCart 3 won't run on OpenCart 4. Three examples, with versions as listed on 31 October 2026:

• Xero Integration, by MarketInSG, lists OpenCart 3.0.0.0 to 3.0.5.0 and 4.0.0.0 to 4.1.0.3, as well as older versions. It exports OpenCart orders, customers and products to Xero.
• Opencart Xero Integration, by opencartcity, lists OpenCart 3.0.0.0 to 3.0.5.1 and 4.0.0.0 to 4.1.0.4. It syncs customers, products and orders, and lets you choose which order statuses are sent, for example only completed orders. The same developer also lists an "Advanced" version.
• OpenCart Xero Connector, by Webkul, lists OpenCart 3.0.0.0 to 3.0.4.1. It syncs data from your OpenCart store to Xero.

Before you buy: check the compatibility list includes your exact version, look at when it was last updated, check how it handles refunds and payments, and test it on a copy of your store and Xero's demo company before connecting your real books.

Option 2: a multi-channel tool

If you sell on several channels, a multi-channel tool can collect orders from all of them and post them to Xero in one place. Check it lists OpenCart as a supported channel, which OpenCart versions it supports, and how it records VAT, fees and refunds in Xero.

Option 3: a custom sync using the Xero API

A custom sync is built around your rules, agreed with your accountant. It connects to Xero the way Xero requires: you approve the connection once from your own Xero login using OAuth 2.0, and never share your password. It's tested in Xero's demo company before it touches your live books.

It's worth it when:

• your VAT is more than one rate, such as standard and zero-rated items, or reverse charge sales
• payments need reconciling, with Stripe or PayPal payments applied to invoices and fees recorded so the bank reconciliation lines up
• you run more than one store, or more than one Xero organisation
• no extension supports your OpenCart version, or the extensions don't record things the way your accountant wants

For the details, see Xero API integration, and for prices, what a Xero integration costs.

What should map to what

Agree the mapping with your accountant before anything is switched on: which account codes sales and delivery charges go to, how each tax rate should be recorded, and which order status means an order should become an invoice.

Common problems

Duplicate contacts. Guest checkouts and repeat customers can each become a new contact. A good sync matches customers to existing contacts before creating new ones.

Orders that never reach Xero. Orders sitting in OpenCart's "Missing Orders", because the payment never confirmed back to the store, won't be sent. If paid orders are missing from your order list, fix that first: see OpenCart not sending order emails, which covers why it happens.

Busy days. Xero allows 60 calls a minute, 5,000 calls a day and 5 calls at the same time for each Xero organisation, plus 10,000 calls a minute across all organisations for an app, and these limits can't be increased. A sync that sends every order the moment it arrives can hit those limits on a busy day, so a good one queues orders and sends them in batches.

Failed syncs nobody notices. A connection can need approving again, or an extension can break after a PHP upgrade. A good sync logs every failure and tells you about the ones it can't fix.

Before you connect anything

Make sure the store is on a supported OpenCart version and working properly, with orders reaching the right status. If it needs work first, see OpenCart fixes.

Using Sage rather than Xero? See Sage Accounting integration.