BigChangeCentrusXero

bigchange + xero

The invoice is in Xero. Centrus does what comes next.

BigChange already pushes invoices, credit notes and purchase orders to Xero, and keeps customers and payments in step. Centrus works across both systems for the work the sync leaves to people: chasing what is overdue, keying supplier bills from the inbox and matching jobs to payments.

Book a demoWhat Centrus adds

already built in

What the BigChange sync does, and what Centrus adds

Keep BigChange's Xero sync. Centrus works across both systems, on the work that still falls to someone in the office.

BigChange's Xero sync

  • Invoices, credit notes and purchase orders raised in BigChange are pushed to Xero.
  • Customers and suppliers sync in the direction you choose.
  • Payments are recorded in one system, BigChange or Xero, and update the other.
  • Supplier invoices are entered in Xero, because BigChange works with purchase orders rather than purchase invoices.

What Centrus adds

  • Overdue invoices chased every Monday in your tone, skipping anyone already talking to accounts.
  • Supplier invoice PDFs from the inbox raised as draft bills in Xero, matched to the PO on the job.
  • BigChange jobs matched against Xero payments, with anything unmatched written to a sheet.
  • Questions that need both, such as whether a customer is on stop before the quote goes, answered in chat.

Checked on 28/10/2026 against BigChange integrations and BigChange Xero FAQ.

examples

Built on BigChange and Xero together

Each one is an example agent or question that reads or writes both systems. Build it as it is, or describe your own version.

  1. 01

    Overdue invoices chased every Monday

    Overdue invoices in Xero chased every Monday from your own inbox, with the job named.

    Read the use case: Overdue invoices chased every MondayWorks with BigChange, Joblogic, Simpro, Outlook, Gmail, Excel, Xero

  2. 02

    Supplier invoices raised as draft bills in Xero

    Supplier invoice PDFs raised as draft bills in Xero, matched to the PO on the BigChange job.

    Read the use case: Supplier invoices raised as draft bills in XeroWorks with BigChange, Joblogic, Simpro, Outlook, Gmail, Xero

  3. 03

    Jobs matched against Xero payments

    BigChange jobs and Xero payments merged on invoice number, with the gaps in one sheet.

    Read the use case: Jobs matched against Xero paymentsWorks with BigChange, Joblogic, Simpro, Excel, Xero
01 / 03

how one runs

The Monday chase, from Xero to sent

One agent, described once in Agent Builder, runs it every week. Finance only deals with the replies.

01

Overdue, from Xero

Every Monday the agent loads invoices 30 to 60 days overdue from Xero, which the BigChange sync keeps current.

02

The job, from BigChange

Each invoice is matched to its job in BigChange, so the chase names the site and the work that was done.

03

Replies left alone

Anyone already in an email thread with accounts is skipped, so nobody is chased in the middle of a conversation.

04

Sent in your tone

The chase is written from your saved templates and sent from Outlook or Gmail, as you. Every run is logged.

See the use case: Overdue invoices chased every Monday

setup

Two connections, each made once

Each system connects on its own card in Integrations. Agents keep their own connection, so a scheduled run never depends on one person staying signed in.

Connect BigChange

In Integrations, open BigChange REST and paste three keys from your BigChange account: Customer ID, Client ID and Client secret. Centrus checks them before saving.

How to connectThe BigChange setup

Connect Xero

Open Integrations and click Connect on the Xero card, sign in with Xero and pick the organisation. Xero sends invoice emails as the person who connects, so the bookkeeper or a director should do it. Others then click Enable.

How to connectThe Xero setup

the integrationBigChangeAsk the live job, and the inbox, the files and the finance system in the same answer. The admin is done by agents and written back to BigChange.the integrationXeroAsk the books what is overdue, raise the invoice, and let agents chase and key the rest.

other pairings

questions

BigChange and Xero questions

Yes, keep it. It moves invoices, credit notes, purchase orders, customers and payments between the two, and Centrus does not replace it. Centrus reads both systems and does the work around those records, such as chasing, keying supplier bills and matching payments to jobs.

Yes, when you allow it. Centrus reads and writes Xero, so it can raise a draft bill or a quote. In Agent Builder, an approval step holds anything sensitive until someone in finance says yes, and every run is logged.

An administrator pastes three BigChange keys once. The bookkeeper or a director connects the Xero organisation, because Xero sends invoice emails as whoever connects it. Agents keep their own connection, so a scheduled chase never depends on one person staying signed in.

Yes. An engineer or estimator asks on WhatsApp whether a customer is on stop before a quote goes. Centrus checks the account and the aged debt in Xero, and holds the quote on the job in BigChange if they are.
Centrus AI

in the 30 minutes

  1. 01We start with how your operation actually runs, on the desk and in the field.
  2. 02We run the Monday chase on a setup like yours, with BigChange and Xero connected.
  3. 03We pick out the admin that should run itself first.

See BigChange and Xero working together.

Bring the job you want handed over, and we will show it on a setup like yours. You leave with a plan.

30 minutes / UK team / No lock-inOr see pricing